Dead iMac with Replaced Power Supply and Logic Board won't power up
iMac 27 mid 2011 failed suddenly overnight after working perfectly.
Will not power up at all. No fans, No chimes, Nothing.
Shows only one LED on Logic Board
Checked cord, outlet, power button etc.
Replaced Power supply - shows one LED, No sign of power
Replaced Logic Board - shows one LED, No sign of power.
Replaced Hard Drive - no change.
Disconnected Optical Drive - no change.
Suggestions… or should I give up?
Ist dies eine gute Frage?
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3,4 Tsd. 
1,1 Tsd. 
2,6 Tsd. 