Replacing the Power Supply in HP and Compaq Desktop PCs
Before you begin
- You need a flathead screwdriver.
- Remove the Pocket Media Drive, if it is present.
- Turn off the computer, and then disconnect all cables. Disconnect the Ethernet or modem cable before disconnecting the power cord.
- 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.
- Do not remove a component from its protective packaging until you are ready to install it.
- Because you must install the replacement power supply in the same orientation as the original part, write down the orientation of the power supply onto a piece of paper; high-connector or low-connector.
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.
View the following video before using the steps in this article.
NOTE:For best quality on dial-up connections, wait until the video has fully loaded before viewing.
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.
Remove the right side panel.
For more information about removing the side panel, refer to the HP support document Opening the PC Case .
Lay the computer on the side.
Place the bottom of the computer toward you and locate the power supply inside the computer.
Trace the power supply cables to the system components:
NOTE:Recording the plug location, type, and orientation of each power supply connection helps ensure you correctly install the replacement power supply and connect it to all the system components. Any missed connection could prevent the computer or a component from working.
Know how the cable connectors connect.
Plugs on the power supply are keyed and can be inserted only when aligned properly with the component connector. In addition, some power connectors have a latch that must be pressed or squeezed to release the cable connector from the socket.
Figure 3: Power connector (without a latch)
Figure 4: Power connector with a latch
Figure 5: Motherboard main power (with latch)
Figure 6: Motherboard fan power (with latch)
Press each plug release latch, if it is present, and disconnect the power supply cables for the system components:
NOTE:Your computer may not use all the plugs on the power supply. Record the plugs as you remove them from the system components.
| Step 7|
Remove the four screws that secure the power supply to the back of the computer.
Locate the power supply latch at the base of the power supply inside the computer.
Press the power supply latch (1), and then slide the power supply (2) to the left to release it.
Move the power supply to the left and then down, freeing it from the computer.
Lift the power supply out of the computer.
Lower the replacement power supply into the computer. (The illustration shows a high-connector power supply installation.)
NOTE:You must install the replacement power supply in the same orientation as the original unit; make sure the orientation of your power supply before inserting it into the computer. Refer to the orientation that was written down earlier if necessary; either high-connector or low-connector type.
Align the power supply in the opening in the back of the computer.
Slide the power supply to the right (toward the back of the computer) until the latch locks it into place.
Insert and tighten the four screws that secure the power supply to the back of the computer.
Route the power supply cables to each of the system components, and then connect them:
NOTE:Your computer may not use all the connectors on the power supply. Be sure to check your record and connect a power supply plug to each system component.
Figure 7: Unconnected power supply cables
|This image shows the power supply cables connected to each of the system components.|
Figure 8: Connected power supply cables
Set the computer upright.
| Step 18|
Replace the right side panel.
For more information, refer to the HP support document Opening the PC Case .