iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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What causes zero response from the computer when powering up?

EDIT: Fixed! It was the PSU that was causing the problem.

I've had this problem for the last year or so each time after a power outage. The computer would refuse to turn on for a bit and I would have to unplug it for awhile and try again later. The "problem" is marked by zero activity from the computer. No fan whirl, no attempt to boot, and no spinning HD. The screen would also remain off.

Usually, after a few days it would work again and there would be no more issues in turning the computer off and on until the next power outage. I haven't been as fortunate this last outage. It's been almost a week and the computer has not turned on again. I've tried multiple outlets, rearranging the RAM, doing the PRAM reset, and trying the power off/power on intervals with every combination of holding and not holding the power button.

I have a feeling the power supply is faulty, but I'd like other opinions before I take the dive and spend the money on something that won't fix my problem.

-Power supply?

-Logic board?

-Hard drive?

Thanks for your help!

Answered! View the answer I have this problem too

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It's been fixed?


Yes! The process was a bit tougher than I thought (some of the cords were tougher to remove than expected...was worried I was going to rip something out), but the instructions were spot on. After replacing the PSU the computer booted up no problem. Money well spent.


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1 Answer

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Power outages can cause power drops and surges both which can harm your computer. Do you have a surge protector? If you have one, it may in fact need replacing given how many power outages you have faced. Think about getting a good UPS to replace it.

Even here in the city our power is quite dirty, we have most of our systems on UPS's just to protect them and what our workers are working on (so they can save things cleanly).

And, yes it does look like your PSU needs replacing given the power outages. Sadly, other things could have gotten damaged too. For now lets hope its just the PSU.

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Thanks for the second opinion Dan. I'm going to cross my fingers and hope its just the PSU and put in a order for a new surge protector too.


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