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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Desktops > G5 Imac Won't turn On?

G5 Imac Won't turn On?
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Mac Monkey
Fresh-Faced Recruit
Join Date: Apr 2012
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Apr 28, 2012, 08:16 PM

I have a G5 Imac that now won't turn on?

The strange thing is that the other day it turned itself on for no apparent reason and was working perfectly for several hours? We had a power cut and after the power came back on the Imac wouldn't?

Any ideas?

Thanks for any advice you can give.

Mac Monkey
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Join Date: Aug 2007
Location: U.K.
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Apr 28, 2012, 08:56 PM
Check the fuse in the plug !

A power surge may have blown the fuse...

iMac Intel Core i5, 2.5GHz, 4GB RAM, 500GB 21.5" Monitor 10.8.3.
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Junior Member
Join Date: Mar 2012
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Apr 30, 2012, 04:04 PM
don't judge a book by its cover :p
Doc HM
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Join Date: Oct 2008
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May 1, 2012, 03:44 AM
Almost certainly the PSU. Easy to swap out, very hard to find replacements at a decent price.
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Mac Elite
Join Date: Oct 2002
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Jul 22, 2012, 01:54 PM
First, do this: http://support.apple.com/kb/HT1767

If not, then it's likely the PSU needs to be replaced. At this point, it MAY not even be worth replacing... but if you need a computer and/or the data isn't backed up, then you may have no choice. The Apple store may have deemed that model too old to repair anymore... so you might have to find one off ebay or something.
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