How to Troubleshoot the Power on a Presario C700

The Compaq Presario C700 receives power from the alternating current adapter, an external power unit that draws AC charge from the wall outlet and converts it to direct current power, a form of electrical current that computer components require. If the computer doesn't turn on when pressing the power button, troubleshoot the AC adapter and the power connector cable. Most often, power problems are due to a defective adapter, but the power connector cable -- which provides power to the motherboard inside the notebook -- can come loose or require replacement.

Things You'll Need

  • Replacement AC adapter
  • Antistatic wristband
  • Small Phillips screwdriver
  • Replacement power connector cable


    • 1

      Connect the power plug to the AC adapter, and then connect the power plug to an outlet. Connect another device to the outlet before plugging in the AC adapter to confirm that the outlet works.

    • 2

      Connect the AC adapter to the Compaq Presario C700. Turn the notebook over so that the bottom is facing up. Confirm that the battery is installed and secured to the PC.

    • 3

      Turn over the Compaq Presario and open the lid. Confirm that the battery indicator light is glowing solid blue. If the battery indicator light is flashing or off, the battery is not receiving power from the adapter.

    • 4

      Press the power button to turn the Compaq Presario on. If the fan spins and the power indicator light comes on, but the screen remains blank, the computer is receiving power, but there is a problem with the video adapter. If the neither the fan nor the indicator light come on -- or both come on, and then immediately shut off -- the AC adapter isn't working.

    • 5

      Replace the AC adapter with an identical or compatible model. Connect the new adapter to the PC, and then repeat the preceding four steps to troubleshoot the power on the C700. If the battery won't charge and the computer won't turn on, check the power cable inside the PC.

    • 6

      Unplug all connected devices and remove the battery from its compartment. Put on an antistatic wrist strap to protect the hardware inside the PC.

    • 7

      Locate the hard drive, found on the bottom of the computer, near the front edge of the notebook. Remove the screws that secure the hard drive panel to the computer. Slide the hard drive to the left and pull it out of the PC.

    • 8

      Remove the screw that secures the optical drive to the computer. The screw is parallel to the optical drive, about four to six inches away. Insert the edge of a paper clip into the release lock, found on the side of the optical drive, and then slide the drive out of the Presario C700.

    • 9

      Loosen the three screws that secure the keyboard to the notebook; the screws are located on the bottom of the computer, near the battery. Turn the computer over and open the lid as far as possible.

    • 10

      Lift up the top edge of the keyboard, and then slide it toward the monitor. Release the keyboard lock, and then disconnect the keyboard cable from the motherboard. Set the keyboard aside.

    • 11

      Turn over the Presario C700 and loosen the screws lining the back edge of the notebook. Flip over the notebook, open the lid as far as possible, and then release the lock that secures the power button board cable to the motherboard. Disconnect the cable.

    • 12

      Remove the switch cover, located just below the monitor, from the computer. Unplug the display cable and microphone cable from the motherboard. Remove the display cable, Wi-Fi antenna cables and microphone cables from their routing guides.

    • 13

      Loosen the screws from the hinge covers. Disconnect the monitor from the Compaq Presario. Turn the computer over and remove all of the screws from the base. Turn the computer right-side up.

    • 14

      Disconnect the LED board cable from the motherboard. Unlock the touchpad cable, and then disconnect it from the computer. Lift up the palm rest to remove it from the notebook.

    • 15

      Disconnect the USB cable connected to the motherboard. Loosen the screws securing the motherboard to the base. Flex the front edge of the base so that the motherboard is clear of the audio connectors.

    • 16

      Lift up the motherboard and remove it from the Presario. Turn over the motherboard, and then locate the power connector cable, found near the Ethernet and VGA ports on the side of the board.

    • 17

      Check the connection. If the power connector cable is loose, reconnect the cable to the motherboard. If the connector cable is plugged in securely, replace the cable with a new one.

    • 18

      Reassemble the Compaq Presario C700 following the preceding directions in reverse. Test the power after reconnecting or replacing the power connector cable.

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