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Mac won't start with no hard drive spinning

https://discussions.apple.com/thread/430...

Please see linked question in Apple Forum and advise.

the reason why i linked is that i wasn't able to insert photos here to clarify my question.

thanks

Answered! View the answer I have this problem too

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Kim - I'd start by replacing the power supply unit.

You do need to work up the food chain to diagnose things like this. Good Luck!

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do you think it is worth trying to replace PSU even though diagnose light indicates Power is OK?

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Thanks Dan,

Here is what i concern as well.

First Light is always ON after i Plugged power cord to the back of my iMac 24.

After I turned it on, all three lights except the last one were ON and OD started spinning, I believe because it made noise.

But after a minute or so, OD stopped and all of sudden, no activity at all.

Hard drive never even start spinning, no chime, no warning, no screen activity whatsoever.

but all three LED light remains ON all time unless I turned it off.

PSU indicates physically damaged. I checked output voltage with my tester.

some of them gives me some voltages but some not. but I don't know what that means i just picked and poked with test needles.

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young kim will be eternally grateful.
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