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Compaq Presario R4000 CTO Notebook PC support

Battery does not power the notebook or hold a charge

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This document pertains to HP Notebook PCs.
The battery might have a defect if it will not power on the notebook, if it will not hold a charge. The battery indicator LED, located near the power icon , either does not glow or always blinks. Another indication of a battery problem is that the computer operates correctly when it is connected to the power adapter, but not when using the battery power.
A battery that does not charge might be the result of a power adapter failure, a battery failure, or a system board failure. Perform the following steps in the order presented to diagnose the failure.
NOTE:The maximum capacity of the battery decreases over time and with use. Loss of battery capacity varies depending on the product configuration and usage, including but not limited to: product model, applications running, power management settings, and product features. The battery warranty does not cover natural deterioration of battery capacity. Your battery is warranted from defects in materials or workmanship resulting in failure. When contacting HP Service and Support, you might be required to run an HP diagnostic test to determine if your battery is covered under the warranty.

Troubleshooting the notebook power supply

To verify that the notebook power supply is functioning properly, follow these steps:
  1. Plug one end of the AC adapter cable directly into a functioning wall outlet, and then plug the other end into the computer.
    NOTE:Do not plug it into a power strip, surge protector, or secondary power source.
  2. Verify the following conditions and take the appropriate action if necessary:
    • Verify that all power cord connections are secure.
      If the AC adapter connection to the computer is loose, the connector might be damaged and require repair. Contact HP service and support for further assistance.
    • Verify that the power button or power LED is lit when the computer is on.
      Depending on the model, the battery indicator LED (also called the power LED) might be white, green, or amber when the power adapter is connected and is providing power to the computer. If the Power LED is off, then you might need to replace the AC power adapter. Contact HP Service and Support for further assistance.
    • Verify that the LED on the AC power adapter is lit when plugged into a wall outlet.
      Some power adapters do not have an LED. In this case, if you have another power supply, try connecting it to the computer and to an AC wall outlet.
    • Verify that the AC power adapter is the correct type.
      The computer was shipped with the correct power adapter, however if you have multiple adapters, make sure that you are using the correct one for your computer.
      Older adapters were rated at 60 watts, but newer notebooks require adapters with 90 or 130 watts.
If you need to purchase a replacement AC power supply, make sure you use the model number of the computer and check for the correct part number of the adapter at the HP Parts Store . You will also need the model number if you call HP Customer Service.
View the Additional information section for information about locating HP Help & Support in your operating system.

Troubleshooting the notebook battery

If you have verified the AC power supply is functioning correctly, use the following steps to troubleshoot the battery:
  1. Unplug all USB devices from the notebook when they are not in use.
    Many notebook models continue to provide power to USB devices through the USB ports, even when the computer is powered off or in a suspended state.
  2. Unplug the AC power cable.
  3. Insert the battery into the battery compartment on the bottom of the notebook computer.
  4. Plug the AC power cable into the computer and into an AC wall outlet, and then allow the battery to charge for 15 to 30 minutes.
    NOTE:The power LED, located near the power icon (displayed as a lightning bolt on most computers) glows while the battery is charging.
  5. Unplug the power adapter cord from the notebook.
  6. Press and release the Power button to start the computer using only the battery as the power source.
    • If the computer powers on, the battery is functioning. However you should run HP Battery Check utility to evaluate the battery's health (see also first link below).
    • If the computer does not power on, continue to the next step.
  7. If you have a second battery for your computer, or you have access to an identical battery, insert the second battery into the computer and performing the Troubleshooting the notebook battery steps again.
    • If the computer does power on with the second battery and the battery charges correctly, contact HP service and support for battery replacement.
    • If the problem remains with the new battery, have the system board replaced.

Additional information

For further information about testing and calibrating the battery in your specific operating system, please refer to the appropriate document in this section.
Compaq Presario R4000 CTO Notebook PC

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