- 1). Turn off your Compaq PC and remove the power cord and any other peripheral devices.
- 2). Remove the four screws securing your ATX power supply to the back of your Compaq computer case.
- 3). Remove the side of your Compaq computer case.
- 4). Disconnect the power leads from the back of your old power supply. There will be two different connectors: one for your motherboard and one for your other devices.
- 5). Remove your old power supply from your Compaq computer case.
- 6). Insert your ATX power supply into your computer case.
- 7). Reconnect the power leads to the back of your power supply.
- 8). Replace the four screws that secure the power supply to your case.
- 9). Replace the side of your computer case and reconnect your peripheral devices to complete the operation.
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