User Guide
iMac (Early 2006 20-inch) Troubleshooting — Symptom Charts 150
Power Issues
No Power.
The iMac (Early 2006) will not turn on. The display remains black and there are no sounds from
the fans or drives.
1. Verify the power outlet is good. Plug a dierent device into the socket to ensure there is power,
or plug the iMac into another outlet. Does the iMac power on now?
Yes. Resolved. Bad outlet.
No: Go on to the next step.
2. Check the power cord. Use a known good power cord. Does the iMac power on now?
Yes: Your power cord has failed. Replace the AC power cord.
No: Go on to the next step.
3. Check the connection of the power cord on both ends. Verify that the power cord is securely
plugged into both the AC outlet and back of the computer. Does the iMac power on now?
Yes: You may have a loose t to your power cord. Replace the AC power cord and test.
No: Go on to the next step.
4. Plug a bus powered FireWire device in like an iPod using a FireWire cable or other FireWire
drive or device with a power LED. Does the iPod show charging or the FireWire device show a
power LED on?
Yes: The AC Power Inlet is good. Go on to the next step.
No: AC power is not being detected. If you’ve veried the outlet and power cord, replace the
AC Power Inlet.
5. Plug a bus powered USB device into the USB ports on the rear of the computer like a keyboard,
iPod Shue or USB 2.0 iPod using a USB cable and press the power button. Does the iPod show
power or the keyboard caps lock LED light?
Yes: The power supply is functioning. Go on to the next step.
Yes, but only for a moment: The power supply cannot maintain power; replace the AC/DC
power supply. If the problem continues replace the DC/DC power supply/inverter.
No: The Power supply has failed. Replace the AC/DC power supply. If the problem continues
replace the DC/DC power supply/inverter.
6. At this point in the Power On process, you should hear a boot chime and see the front LED on
the computer light up. When the main logic board and LCD panel communicate to deliver video,
the front LED should go out. Does the Front LED go o?
Yes: The LCD and main logic board have communicated. If there is no picture on the display,
follow No Video troubleshooting.