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Helpful answers
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May 11, 2016 5:20 AM in response to snell1984by Klaus1,★HelpfulA clicking noise usually means the hard drive is failing or has failed.
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May 11, 2016 5:22 AM in response to Klaus1by snell1984,the noise come from the bottom off the g5 (psu) and if i plug the power cable just clicking nothing else .
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May 11, 2016 6:24 AM in response to snell1984by Limnos,How long has this been unplugged? A bad PRAM battery can cause startup problems.
Texas Mac Man's PRAM, battery, PMU tutorial - https://sites.google.com/site/macpram/mac-pram-nvram-cuda-pmu-battery-tutorial
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May 11, 2016 7:16 AM in response to Limnosby Pheidius1,Almost certainly a bad power supply. Get a voltmeter and test the voltages going into the board.