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Versão atual de: stitchrobot ,

Texto:

You could try opening your iMac so you can turn it on and see if the diagnostic leds light up.
http://support.apple.com/kb/HT2831
 
in particular:
 
Locate the large white arrow in the middle of the computer.
Above this arrow, you'll see four LEDs:
 
LED 1 indicates that trickle voltage from the power supply has been detected. This LED will be ON when the computer is turned off and your power supply is working correctly.
 
UPDATE:
 
If the 1st light is on that indicates that the power is flowing to the computer. So it could very well be a logic board failure. At this point i'm not sure trying to repair a logic board failure is worth it.
Sorry.
 
Make sure you pull the HD though if you want to recover your data.

Status:

open

Postagem original de: stitchrobot ,

Texto:

You could try opening your iMac so you can turn it on and see if the diagnostic leds light up. 
http://support.apple.com/kb/HT2831

in particular:

Locate the large white arrow in the middle of the computer.
Above this arrow, you'll see four LEDs:

LED 1 indicates that trickle voltage from the power supply has been detected. This LED will be ON when the computer is turned off and your power supply is working correctly.

Status:

open