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Compaq Presario CQ5810 Desktop PC support

Computer Does Not Start (Windows 7)

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This document applies to all HP and Compaq desktop, All-in-One, and HP TouchSmart computers that come with Windows 7.
This document provides possible solutions to many common computer startup issues. Select the symptom that most closely matches your computer’s symptom from the following list to find a solution to the problem. If you cannot find a symptom that matches your computer's symptom, then continue to Step 3 for steps to check if the hard drive is detected in BIOS .

View a video on what to do when your computer does not start

Step 1: Removing discs and devices to test a computer that does not start

Remove any discs, any and all USB devices, and remove memory cards from the card reader slot. Disconnect all non-essential devices (printers, scanners, external hard drives, and similar). Do not have anything connected to your computer except for a keyboard and mouse.
After you have removed all discs and devices, turn on the computer. What happens?
  • If the computer starts, reconnect devices one at a time while restarting the computer to figure out which disc or device is causing the problem. You are done.
  • If the computer still does not start and exhibits the same problem, press and hold the power button to turn off the computer, do not connect anything and continue troubleshooting.

Step 2: Finding the symptom that matches your computer's symptom to troubleshoot startup issues

Read the following list of symptoms. If you find a symptom that matches your computer's symptom, click the corresponding link. This link takes you either to a support document that contains troubleshooting steps for your computer’s issue or to the general troubleshooting steps provided in Step 3. If you cannot find a symptom that matches your computer's symptom, see Step 3 for steps to check if the hard drive is detected in BIOS .
For desktop computers, see Troubleshooting Power Supply Issues .
For All-in-One and HP TouchSmart computers, follow these steps:
  1. Make sure your computer is receiving power. Check whether or not the power LED lights on the back of the computer and the AC adapter are illuminated.
    NOTE:Not all AC adapters have a light.
    If the power LED lights are not illuminated, continue following these instructions.
    If the power LED lights are illuminated, skip to step three of these instructions.
    Figure 1: Power LED is illuminated
    Power LED is illuminated
  2. Plug another item, such as a lamp, into the wall outlet, and then turn it on to verify that the wall outlet has power.
  3. Unplug the item, and then plug the power cord for the computer into same the wall outlet.
    • If the computer turns on, you are finished troubleshooting.
    • If the computer still does not turn on, unplug the power cord from the wall outlet and continue troubleshooting.
  4. Remove all extension cords, power strips, surge protectors, and converters; and then plug the power cord directly into the wall outlet.
  5. Press the power button.
    If the computer still does not turn on, unplug the power cord from the wall outlet and continue troubleshooting.
  6. If you have not done so already, remove media from CD/DVD drives, USB ports, and memory card reader slots, and disconnect all non-essential devices (printers, scanners, external hard drives, and similar). Leave only the keyboard and mouse connected to the computer.
  7. Reconnect the power cord, and then press the power button.
    If the computer still does not turn on, disconnect the power cord and continue to the next step in these instructions.
  8. With the power cord disconnected, press and hold the power button for five seconds.
  9. Reconnect the power cord, and then press the power button on the computer.
    If the computer still does not turn on, continue to the next step in these instructions.
  10. If the computer has an AC adapter, check the adapter and cord using the following steps.
    If the computer does not have an AC adapter, skip to step 11 in these instructions.
    Check the AC adapter and power cord for damage. If the cord or AC adapter are damaged, replace the AC adapter.
    Figure 2: Damaged power adapter and cord
    Damaged power adapter and power cord
    If the cord and adapter do not appear to be damaged, check the temperature of the adapter. When it is operating correctly, it should feel slightly warm to the touch after it has been plugged in for a short time.
    If the power adapter is warm but the computer does not turn on, skip to step 11.
    If the AC adapter is not warm, make sure the power cord is completely inserted into the socket on the power adapter.
    Figure 3: Power adapter and cord
    Power adapter and cord
    Wait 30 minutes and check the temperature of the adapter again.
    If the power adapter is still cold and the computer does not turn on, replace the power adapter.
  11. If all of the above steps have been tried and the computer does not turn on, the computer might require service. Contact HP (in English) for additional assistance.
Beep sounds typically occur when a keyboard key is stuck, a memory DIMM or hard drive cable is not seated properly, or a component on the motherboard has failed. Disconnect the mouse and keyboard, and then restart the computer. If the beeping noise stops, repair or replace those devices.
To find out more information about a specific beep pattern, see BIOS Beep Codes and Error Message Descriptions .
If the monitor is on, but the screen remains blank when you turn on the computer, or if an error message stating that a video signal is not detected displays on the monitor when you turn on both the monitor and computer, see one of the follow HP support documents based on your type of computer:
Select the closest match from the following list of error messages to find a solution to the problem. If a symptom does not match the condition of the computer, see Step 3 for steps to check if the hard drive is detected in BIOS .
For desktop computers, please see Error: CPU Fan Failed for steps to resolve this error message.
For All-in-One or HP TouchSmart computers, the computer might require service. Contact HP (in English) for additional assistance.
For all file missing error messages that cause startup problems, see Standard steps to resolve most startup problems when a hard drive is detected .
To resolve operating system not found error messages, see Step 3 for steps to check if the hard drive is detected in BIOS .
During the startup process, the computer is attempting to process information from an external media source. Remove any media from the floppy drives, CD/DVD drives, USB ports, and memory card reader slots, and disconnect all non-essential devices (printers, scanners, external hard drives, and similar). Leave only the keyboard and mouse connected to the computer. If the issue persists, see Step 3 for steps to check if the hard drive is detected in BIOS .
The CMOS (backup) battery on the motherboard has run out of power. The CMOS battery backs up the time and other settings when the computer is turned off. Remove and replace the CMOS battery, and then correct the time to prevent this error message from reoccurring. You can also press the F2 key to bypass this error message, however, the time and date will be incorrect and should be reset.
Windows expects you to enter a product key for authentication purposes. Enter the product key from the side panel of the computer. If problems persist or you want to learn more, see Windows Product Activation .

Step 3: Checking if the hard drive is detected in BIOS

Perform the following steps to determine if the hard drive is detected in BIOS:
  1. Remove any media from the floppy drives, CD/DVD drives, USB ports, and memory card reader slots, and then disconnect all non-essential devices (printers, scanners, external hard drives, and similar). Leave only the keyboard, mouse, and monitor connected to the computer.
  2. Turn on the computer, and then press the F10 key repeatedly at the first screen to open the BIOS Setup tool.
  3. Verify that a hard drive name is listed from the main screen.
    Figure 4: Example of a hard drive name listed in the BIOS (Western Digital)
    • If the hard drive name is listed, exit the BIOS without saving any changes, and then continue with the steps in the Hard drive is detected section.
    • If the hard drive name is missing, or the text Auto or None is listed, exit BIOS without saving any changes, and then continue with the steps in the Hard drive is not detected section.
Use the following procedure to repair the file system on the hard drive:
  1. Turn off the computer, and then wait at least five seconds with the computer completely turned off.
  2. Turn on the computer, and then press the F8 key repeatedly as the computer starts.
    The Advanced Boot Options screen opens if the system partition on the hard drive is still working correctly.
    NOTE:If the Advanced Boot Options screen does not open, obtain a set of recovery disks. Insert the first recovery disc into the drive, and then turn on the computer. From the Recovery Manager main screen, select Advanced Options, and then select Microsoft Startup Repair. Click Next. For desktop computers, skip to step eight of these instructions, for All-in-One and HP TouchSmart computers, continue to the next step of these instructions.
  3. Select Repair Your Computer, and then press Enter.
  4. Select a keyboard layout that matches your country or region, and then click Next.
  5. When the login prompt displays, select the user name with Administrator rights (not Administrator) from the User Name drop down. The user name with Administrator rights is most likely the first user name that was entered during the initial computer setup.
  6. Type the login password into the Password field, and then click OK.
    A System Recovery Options window opens.
    NOTE: If you do not know the password, leave the Password field blank and click OK. If you are unable to get past the password window, notify the system administrator for the password or perform a system recovery to restore the system to its previous state.
    Figure 5: System Recovery Options (The window on your computer might look different)
    Image: System Recovery Options
  7. Click Startup Repair.
    A Startup Repair window opens and automatically scans for startup problems.
    Figure 6: Startup Repair
  8. Perform the actions suggested by Startup Repair: system restore, correct damaged or missing files, or other action.
    NOTE:A window might display stating that Startup Repair cannot repair this computer automatically. If an Internet connection is active, click Send information about this problem to help Microsoft better understand and react to these issues. Otherwise, continue to the next step of these instructions.
  9. After Startup Repair has finished scanning the computer, try to open Windows.
    • If Windows opens successfully, troubleshooting is complete.
    • If Windows does not open, repeat steps one through six to open the System Recovery Options window, and then continue to step ten of these instructions.
  10. From the Startup Recovery Options window, click Command Prompt.
    NOTE:If you had to use recovery discs to run Startup repair, press ALT + D at the Advanced Recovery Options screen to open the Command Prompt window, and then press the Enter.
  11. In the Command Prompt type bootrec /fixboot, and then press the Enter.
  12. Type bootrec /fixmbr, and then press Enter.
    Figure 7: Command console
  13. To close the Command Prompt, type exit to close the Command Prompt, and then press Enter.
  14. Click the Restart button in the System Recovery Options window to restart the computer and open Windows.
    • If Windows 7 opens, you are done.
    • If Windows 7 does not open, continue using these steps.
  15. Perform a full system recovery using recovery discs. For more information refer to the HP support document Performing an HP System Recovery in Windows 7 .
  16. If the computer does not startup properly after performing a full system recovery, replace the hard drive.
Select your type of computer from the following options for specific troubleshooting steps for when the hard drive is not detected in BIOS:
Perform the following steps when the hard drive is not detected in the BIOS on a desktop computer.
Step 1: Reset the BIOS in a desktop
Reset the BIOS to make sure the BIOS settings are correct:
  1. Turn on the computer, and then press the F10 key repeatedly to open the BIOS setup screen.
  2. Press the F5 key to reset the default BIOS settings. Use the arrow keys to select Yes or OK, and then press Enter.
  3. Press the F10 key to save settings and exit. Use the arrow keys to select Yes or OK, and then press Enter.
  4. Turn off the computer.
  5. Remove the power cord.
  6. Press and hold the power button for five seconds.
  7. Reconnect the power cord, and then turn on the computer.
    • If the startup problem is gone, troubleshooting is complete.
    • If the startup problem still exists, continue to the next step.
Step 2: Disconnect and reconnect the hard drive cable when it is not detected in BIOS
Use the following steps to remove and reseat the hard drive cables:
WARNING:The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer.
CAUTION:This product contains components that can be damaged by electrostatic discharge (ESD). To reduce the chance of ESD damage, work over a noncarpeted floor, use a static dissipative work surface (such as a conductive foam pad), and wear an ESD wrist strap connected to a grounded surface.
  1. Loosen the side panel screws, and then slid the panel to the back of the computer to remove the side panel.
    Figure 8: Example of one type of side panel. Your computer might be different.
  2. Find the power cable connected to the hard drive. Disconnect and reconnect the power cable.
    IDE power and data cable locationSerial ATA (SATA) power and data cable location
  3. Find the IDE or SATA data cable connection to the hard drive. Disconnect and reconnect the IDE or SATA data cable from the hard drive.
  4. Find the IDE or SATA data cable connection on the motherboard. Disconnect and reconnect the IDE or SATA data cable from the socket on the motherboard.
  5. Replace the side panel.
  6. Plug the power cable back into the computer.
  7. Turn on the computer and wait to see if the startup problem still exists:
Step 3: Replace the hard drive
If the startup problem still exists, replace the hard drive.
Step 4: Switch data and power cables with optical drive when troubleshooting the hard drive
Switch the data and power cables with the optical drive. Note if the optical driver is no longer detected when you use it with the hard disk drive (HDD) cables.
Step 5: Install the hard disk drive into another computer when troubleshooting the hard drive
If another computer system is available, install the HDD as a data drive into the other system to test if the HDD is detected and known-good or not. You can also install another known-good drive into the computer you are troubleshooting to reverse this test.
Step 6: Check the power cabling when troubleshooting the hard drive
The black or brown 4-pin drive power headers on the system board are keyed so the drive power cable can (normally) only be inserted one way. But, it is possible for the customer to force the drive power cable in the wrong way, despite the keying.
Remove the drive power cable from the brown or black connector on the system board and check if it was inserted incorrectly.
Figure 9: A 4-pin drive power header two drive power connectors on the system board that are facing the opposite direction
Image: A 4-pin drive power header two drive power connectors on the system board that are facing the opposite direction
Perform the following steps when the hard drive is not detected in BIOS on an All-in-One or HP TouchSmart computer.
Step 1: Reset the BIOS in an All-in-One or HP TouchSmart
To make sure the BIOS settings are correct, reset BIOS:
  1. Turn on the computer, and then press the F10 key repeatedly to open the BIOS setup screen.
  2. Press the F5 key to reset the default BIOS settings. Use the arrow keys to select Yes or OK, and then press Enter.
  3. Press the F10 key to save settings and exit. Use the arrow keys to select Yes or OK, and then press Enter.
  4. Turn off the computer.
  5. Remove the power cord.
  6. Press and hold the power button for five seconds.
  7. Reconnect the power cord, and then turn on the computer.
    • If the startup problem is gone, troubleshooting is complete.
    • If the startup problem still exists, continue to the next section.
Step 2: Reseat the hard drive in an All-in-One or HP TouchSmart
To reseat the hard drive, perform the following steps:
NOTE:For detailed instructions, go to the HP Support Web site , enter the computer model number, and then search for replacing the hard drive.
WARNING:The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer.
CAUTION:This product contains components that can be damaged by electrostatic discharge (ESD). To reduce the chance of ESD damage, work over a noncarpeted floor, use a static dissipative work surface (such as a conductive foam pad), and wear an ESD wrist strap connected to a grounded surface.
  1. Remove the back hard drive cover(s).
  2. Remove any hard drive screws that hold the drive to the chassis.
  3. Disconnect the cables from the hard drive.
  4. Lift the hard drive out of the computer.
  5. Reinstall the hard drive back into the computer, and then turn on the computer. The computer should display either the HP or Compaq logo screen.
    • If the startup problem is gone, you are finished but you may want to update the BIOS if one is available for your model of computer.
    • If the startup problem still exists, the computer probably requires service. Contact HP (in English) as the hard drive or motherboard might be defective.
Compaq Presario CQ5810 Desktop PC

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