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The iMac will turn on and the screen lights up after 5 seconds, it then power cycles off and then you hear the chime as normal screen lights up and powers off again after 5 seconds, keeps doing that repeatedly.
I already have:
Any idea what would cause this?
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Please see my previous answer on this:
Apple STUMPED - iMac shuts off randomly, daily to multiple times/hour
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With everything connected try running diagnostics. restart your system and holding the D key. Let us know what you get for an error message.
Reference: Mac startup key combinations
由 Dan 完成的
Yeah it won't stay on long enough to perform diagnostics. It turns off after 10 seconds or so.
由 dave 完成的
New power supply time and a surge suppressor or better yet a UPS!
由 Dan 完成的