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Replacing the Power Supply in HP and Compaq Desktop PCs

This document pertains only to HP desktop computers with the following computer case:
Before you begin
  • Turn off the computer, disconnect all cables, and transfer the computer to a clear, flat, stable work surface over a non-carpeted floor.
  • HP strongly recommends the use of an anti-static wrist strap and a conductive foam pad when working on the computer.
  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.
Video overview
View the following video before using the steps in this document.
Replacing the Power Supply
Use the steps in this section to replace a power supply.
  warning:
Make sure the computer is disconnected from power before starting.
Do not attempt to disassemble or repair the power supply, or this could cause personal injury and equipment damage. Always replace the entire power supply.
Your computer comes with a power supply, which is secured to the back of the computer.
Step 1. With all the cables disconnected from the computer, remove the right side panel.
If necessary, refer to the HP support document, Opening the PC Case.
Step 2. Disconnect all power supply cable connectors that are attached to the various internal components (hard drives, CD/DVD drives, and other internal devices).
  note:
If your computer has serial ATA power and data cables, the connectors must be squeezed to disconnect them.
Step 3. Remove the power supply connectors attached to the various connectors on the motherboard. Remember the cable connector types and where they connect on the motherboard. Use labels if necessary.
Step 4. Remove the four screws that connect the power supply to the back of the computer.
Step 5. Press the latch at the bottom of the power supply, ...
... pull the power supply toward the center of the computer, and then pull it out and away from the computer.
There is a latch, a guide, and a ledge on the computer that help secure the new power supply in the computer.
Step 6. To replace the power supply, align it toward the guide and the ledge, and then slide it toward the back of the computer until it locks into place.
Step 7. Attach the four screws that secure the power supply to the back of the computer.
Step 8. Connect the power connectors to the computer drives.
Step 9. Connect the power connectors to the motherboard.
Step 10. Replace the right side panel.
If necessary, refer to the HP support document, Opening the PC Case.

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