Diagnostic LED 2 dimly lit before power button pressed, will not boot
iMac 17” 2 GHz A1208 does not boot, no chime, no fans or other mechanical activity. Opened it up to see the diagnostic LEDs. Upon plugging in, LED 1 lights up normally, and LED 2 lights up at about half brightness and before I touch the power button. I have not been able to find any documentation on the two observed behaviors in LED 2 (on only DIMLY, and on BEFORE I touch the power button). What does this mean? Bad PSU? Bad logic board? I have one of each on order. Only “repair” I’ve done on it so far is swap out the clock battery. Thanks in advance for your help.
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