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PowerMac G4/Dual 500 won't power-up.

Posted on 2011-03-13
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Last Modified: 2013-11-24
My G4 dual 500 won't power-up. I push the power button and nada. I've reset the PMU. I've left it unplugged then reset the PMU. The battery is only a couple years old. I've removed the battery, left it for days, also unplugged it. Nothing seems to work. Is it the power-supply?
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Question by:olliefelde
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by:Scottyworld
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No sure how competent you are with a volt meter! but Apple provide a doc that expains how to check the PSU

http://docs.info.apple.com/article.html?artnum=95064

If you're lucky it will just be the PSU, if not, it could be the logic board  :o(
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by:arnold
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Or the power switch:)
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by:strung
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G4's were notorious for power switch problems:  http://www.zdnet.com/news/power-switch-glitch-hits-some-g4-macs/111977
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mccrick earned 500 total points
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Yes. It's the power supply. If you press the power button and get a quick blue flash from the power switch, your power supply is usually OK.  In that case, reseting the PMU will work or you have a bad logic board. If you press the power button and as you say "nada," that's a power supply. If you do decide to replace the power supply, be sure to get the exact right one. Some similar models do not share the same PS. Buying the wrong one and installing it will be a bad test.
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by:olliefelde
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Thanks. I pulled the power supply and replaced it with one from another machine that's identical. Worked great!
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