iMac will not power up after power surge. Looking for next steps.
I have an A1224 / EMC2266 20” iMac (Early 2009) that will not boot up after a power surge. The machine will power on (you can hear the fans running) for about 3 seconds, shut off, then power on again and stay powered on. I do not get a chime or anything on the display. Besides attempting to reset the PRAM, I have tried replacing the power supply, but still getting the same results.
As for the Diagnostic LEDs, LED #1 is on when power is supplied to the computer. #2 is on after the power button is turned on (during first 3 secs and again after 2nd power on). There is no LED in slot #3 (see attached picture) and LED #4 does not turn on at all.
From what I’ve read online it could be the logic board or the graphics card still causing the issue. I was wondering if there is a way to determine which one (or any other component) is the root cause. I’m trying to prevent purchasing a replacement part that will not resolve the problem (like I found out with the power supply). Any feedback or additional recommended troubleshooting is appreciated. Thanks!
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