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Compaq Presario SR1030NX Desktop PC support

Troubleshooting Power Supply Issues

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This document pertains to HP and Compaq desktop computers.
Power supply problems can easily be mistaken for other startup issues. Before assuming the power supply is at fault, it is important to first diagnose the nature of the problem in order to find correct troubleshooting steps. To diagnose the problem, plug a grounded power cord from the computer into a grounded power outlet. Once the cable is connected, press the power button on the front of the computer and look at the small light (LED) and fan on the power supply at the back of the computer. Use one of the following links that matches what you see and hear.
NOTE:The Power Supply LED is not available on all the desktop computer models.
Figure 1: Power supply light
Image of the power supply light

Checking the power source

Follow these steps to power source and power cord of the computer.
  1. Plug a working electronic device into the same outlet to see if the wall outlet has power. Try the computer in a different outlet in order to eliminate the outlet as a possible source of the issue. Test both the computer and the working electronic device to see if the wall outlets have power.
    Show me how
  2. Remove all extension cords, power strips, surge protectors and any converters that remove ground. Plug the power cable directly to the wall outlet. Test for power. If this fixes the issue, find the device that is causing the issue and do not use it.
    Show me how
    NOTE:If you find the device that was causing the problem was a surge protector, resetting a breaker or fuse on the surge protector might fix the issue.
  3. Remove all attached devices except for keyboard, mouse, and monitor.
  4. Remove any internal component that was recently added, such as video card, memory, CD, DVD, and hard drives. An added device takes more power. The additional power needs can exceed what the power supply is rated for. If the problem goes away when the component is removed, then please remove the recently added internal component.

Power supply fan is noisy or having interference

Follow these steps to clean, and then test the fan.
  1. Use a vacuum cleaner to remove the build-up of dust from the power supply fan vent holes. Make sure that the computer is turned off and that the power cord is plugged into a grounded outlet. Only use the end of the vacuum hose near the outside of the fan entrance.
    Show me how
    Figure 2: Power supply vent
    Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
  2. Plug in the power cord and test to see if the fan continue to have noise of interference.
  3. If you have tried all of the previous steps and the power supply light remains off, use the steps in the next section, Power supply light comes on or flashes , to reseat the cables and check the power switch connector.

Power supply light does not turn on or power supply fan does not spin

Perform the following steps until power is restored or it is determined that there is a hardware failure:
NOTE:If the power supply fan spins when the computer is turned on but the light does not turn on, see Power supply light comes on or flashes .
  1. Disconnect everything from the computer, including the power cord.
  2. With the power cord disconnected, press the power button on the front of the computer.
  3. Plug in the power cord to see if the computer automatically turns on. If the computer does not turn on, continue using these steps.
  4. Swap the computer's power cord with the monitor's power cord, and then test to see if the computer can turn on.
  5. Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
  6. Plug a working electronic device into the same outlet to see if the wall outlet has power. Try the computer in a different outlet in order to eliminate the outlet as a possible source of the issue. Test both to see if the wall outlets have power.
    Show me how
  7. Remove all extension cords, power strips, surge protectors and any converters that remove ground. Plug the power cable directly to the wall outlet. Test for power. If this fixes the issue, find the device that is causing the issue and do not use it.
    Show me how
  8. If all of the above steps have been tried and the power supply light remains off, use the steps in the next section

Testing the power supply separately from the system

Follow these steps to test the power supply.
Using the computer system but unplug all of the power supply unit (PSU) connectors from the motherboard:
  1. Insert the AC power cord into PSU.
  2. Enable PS_ON to turn the PSU.
      With 3 connectors: P1 – 6pins, P2 – 6 pins, P3 – 4pins.
      Connect or short PS_ON signal (P2 pin 3, green color wire) to Ground (P1 pin 1-2, black color wires) using a jumper wire.
      Figure 3: Commercial PSUs
      Image: Commercial PSUs
      1 - Jumper wire; metal paper clip can be used
      2 - P1 connector with 24 pins
      With P1 connector – 24 pins and other SATA connectors (2 or more).
      Connect or short PS_ON (P1 pin 16, green color wire) to Ground (P1 pin 17-19, black color wires) using a jumper wire.
      Figure 4: Consumer PSUs
      Image: Consumer PSUs
      1 - Jumper wire; metal paper clip can be used
      2 - P1 connector with 24 pins
  3. Check if the PSU fan is rotating.
    • If the PSU fan is rotating, the PSU has output voltage and is good.
    • If the PSU fan is not rotating, you cannot turn on the PSU and the PSU is bad. Replace the PSU.

Power supply light is on and flashes

Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure:
CAUTION:This product contains components that are easily damaged by ElectroStatic Discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap that is connected to a grounded surface, like the metal frame of a PC.
  1. Disconnect all attached devices from the computer, including the power cord.
  2. With the power cord disconnected, press the power button on the front of the computer and wait ten seconds.
    Show me how
    Plug in the power cord and test to see if the computer turns on. If not, continue using these steps.
    NOTE:If the power supply fan makes an inconsistent grinding sound or stops and starts erratically, replace the power supply.
  3. Find the defective part.
    1. With the power cord disconnected, remove the case or side panel.
    2. Disconnect all power cable connectors from their connectors on the motherboard and from the back of internal devices (the back of drives). Make sure to label or remember where each cable connects for future reference.
      Figure 5: Example of common power connections
    3. Replace the side panel, plug in the power cord, and examine the light on the back of the power supply:
      • If the LED is on solid, the power supply is probably good and the problem is most likely caused by a defective component (processor, memory, PCI card) or a defective motherboard. Have the computer serviced, or remove the components and replace them, one at a time, to find and replace the defective component.
      • If the LED is still flashing (it should not flash with all connectors removed), plug the power cable into a different power outlet that is known to be good. If the LED still flashes, the power supply should be replaced.
      • If the LED light is now off, plug the power cable into a different power outlet that is known to be good. If the LED stays off, the power supply should be replaced.

Ordering a replacement power supply

You can find your power supply’s part number on the power supply label.
Find the Spare Number or Part Number.
The Spare Number or Part Number are in the following format: xxxxxx-00x.
Figure 6: Find the Spare Number or Part Number
Image: Find the Spare Number or Part Number
If the part number is not listed on the power supply or is unreadable, follow these steps to use the HP PartSurfer website to find a list of power supplies that are compatible with your computer.
CAUTION:If you use a power supply that is not listed on HP PartSurfer for that computer as a replacement, you risk voiding the computer’s warranty or damaging the computer.
  1. Open the HP Parts Ordering website (in English). If necessary, select your country/region and language in the upper right corner of the page.
  2. Enter the power supply part number or the computer's product name into the corresponding search field.
    The name of the computer is on a sticker attached to the computer case.
    NOTE:If you entered a part number, skip to line item 5.
  3. Follow the instructions on the pages to find and view a list of all parts associated with the computer product name.
  4. From the list of parts, find a power supply.
    Figure 7: Example of a power supply part listed on the HP Parts Ordering website
  5. If the part is available (has a green check mark), you can order from HP by completing the instructions on the page.
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