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Hello, my iMac isn’t turning on after I reassembled it.
The testing LEDs work weird:
When I connect power cable to iMac LED 1 is blinking 1 time and then turning on.
When I press the power button, LED 1 is turning off.
No other LEDs are turning on.
The PSU unit is making some humming noises when is connected to power
What could be a reason for such a behaviour?
Thanks a lot for answering!
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Your power supply is not working correctly. As to why given what you’ve added I would suspect you have either a damaged cables or a bad SSD.
Best to backwind your changes, disconnect from the logic boar the cable connections are you belt o get the onboard diagnostics to get to the graphics test (without the display mounted).
Был ли этот ответ полезен?
I tried to disconnect everything form motherboard except psu, GPU, CPU and one unit of RAM, nothing changed.
So I assume I have to buy new PSU, right?
At this point that's what I would do. But, I use ESD precautions. Here your logic board could be damaged as well.
You'll need to start with this and then hope for the best.
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What did you do that required opening the system?
из Dan
@danj I changed thermal paste on CPU and GPU + replaced HDD and DVD ROM with 2 SSDs
из strimban
Did you use proper ESD protection?
из Dan
@danj unfortunately no, I don't have any
из strimban