Will not boot. replaced power supply, still only 1 diagnostic light
Replaced power supply and memory, but iMac 20 still won't boot up. Only 1 diagnostic light
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This sounds more like your drive has failed if you are seeing the screen and an folder icon is shown with a blinking question mark.
Taking the display off will impact the onboard LED's as the screen won't vibe wired in so while LED #1 is lit it only tells us power is getting to the logic board, as you also altered the RAM we can't rule out if the RAM is good of fully inserted. I would go back to the original RAM to see if things are working.
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No mattem what I have tried, the computer will not boot up, absolutel no activity, onthe than the one diagnostic led. I am considering replacing the logic board but would lie an expert's opinion before I do that.
Can you give us a bit more here. What happened to the system? Did you get a power outage or lighting strike nearby?
door Dan
It was a slow process of not booting up. Held the on button for a few seconds, and then would boot normally. Finally reached the poin it would not boot at all.
door Wallace Hamilton