iMac G5 (20-inch iSight) Troubleshooting — Symptom Charts 149
Power Issues

No Power.

The iMac G5 will not turn on. The display has no picture or color and no sounds can be heard
coming from the fan or hard drive.
Verify power outlet is good. Plug a dierent device into the socket to ensure there is power, 1.
or plug the iMac G5 into another outlet.
Check the power cord. Use a known good power cord.2.
Check the connection of the power cord on both ends. Verify that the power cord is securely 3.
plugged into both the AC outlet and the back of the computer.
Remove keyboard, mouse, and other peripherals such as external speakers, memory cards 4.
connected to the card reader, and FireWire or USB devices. Try starting up the computer with
these devices removed. If the computer starts up, re-connect the peripherals one at a time
until you determine which device is causing the “no power” symptom.
Remove the front bezel to access the diagnostic LEDs on the main logic board. See 5.
“Accessing the Diagnostic LEDs” in the Troubleshooting chapter for complete instructions on
this procedure.
With the front bezel and speakers removed, locate LEDs 1 through 4 on the main logic board. 6.