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Hi
The imac turned off one day. Currently it only boots to Apple logo, then restarts, the logo appears again, then screen goes black. I can't get into disk selection or Apple Diagnostics.
Replacing the ram, hard drive (both HDD and flash), power supply does not help.
What could be the reason?
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Try using an Apple USB keyboard to get to the onboard diagnostics. Press the D key as soon as the screen flickers to get to diags. Let us know what you get.
这个答案有帮助吗？
I already tried that, no change, all the time stuck on logo.
Hi. Is there any update on this case? I do have similar problems here.
@mahew2 - Sadly this sounds like a logic board issue.
@mahew2 if you have wired keyboard, did you try reset NVRAM or hold ALT key to see if you have option to boot from another device ?
Thanky @roboscrap & @danj. Unfortunately, no keyboard command is working on boot. iMac is already disassembled and logicboard is going to be inspected. Since @hubertpudelek seemed to have exactly the same symptoms, it's likely a similar cause – therefore the question if there were any new findings.
Oh, and btw: All 4 LED's on the motherboard are lighting up.
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