6500612200-Watt Power Supply Revision 1
||This graphic shows the location of the test switch on the side of the 200-watt power supply. The test switch and LED help to better determine if a no power situation is due to a problem with the power supply.
The green LED is always on when the computer is powered on. If the computer is not receiving power, perform the diagnostic test below.
- Verify that the computer is turned off.
- Remove the case from the computer.
- Disconnect all of the red, yellow, and black power leads from each floppy disk drive, optical drive, and the tape backup unit (TBU) in the computer.
- Disconnect all power leads from the motherboard. The only device that needs to be connected to the power supply is the hard drive.
- On the power supply, press and hold the test switch for five seconds, and then check to see if the green power supply LED is on.
- If the LED lights:
- The power supply is good. A component that was plugged into the power supply is causing the computer to not turn on.
- Connect devices in one at a time, testing with the test switch between each device connection to determine what is causing the power issue.
- If all devices are plugged in and the light is working, the connections may have needed to be reseated, or there is a possible power switch issue.
- If the LED does not light:
- Disconnect the power lead from the hard drive, and then connect it to the CD-ROM drive. Use the test switch again to determine whether the LED lights.
- If the LED lights, follow the instructions in the "If the LED lights" section above.
- Confirm that power from the power supply is connected to the motherboard. Remove all cards and cables from the motherboard.
- On the power supply, press and hold the test switch for five seconds, and then determine whether the green LED is on.
- If the LED is lit, put the devices back in one at a time, testing between each device to determine what is causing the issue.