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power supply on gigabit ethernet G4
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Fresh-Faced Recruit
Join Date: Feb 2000
Location: newton, ma, usa
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My G4 will boot and run normally for a couple of minutes then the power goes off to all components. If I try to restart it immediately nothing happens. If I wait 10 minutes the computer will boot and then run for a few minutes before the power shuts off again.
Any suggestions? Does anyone know where to get a cheap replacement power supply? I have power supply from a rev A G3 300 tower but it does not look like they are compatible.
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Moderator 
Join Date: Apr 2005
Location: Cambridge, UK
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Check that the fan is spinning in the power supply because it might not be working thus the power supply overheating and turning off.
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Mac Elite
Join Date: Sep 2006
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I think seanc is on to the problem. Check this out:
Hardware Monitor: Description
See if your power supply is overheating.
Apple made a whole lotta different power supplies for the G4's.
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Mac Elite
Join Date: Mar 2001
Location: Madison, WI
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Moderator 
Join Date: Apr 2005
Location: Cambridge, UK
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Those prices are horrific, they all are, no matter where you are in the world. You can with some reading and patience mod a normal ATX power supply to work in a DA/QS but it would mean that the ADC port and old style ACDs wouldn't work.
If anyone's interested i'll write up a PDF explaining how to do it. I replaced my dead QS PSU this way, works flawlessly.
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Fresh-Faced Recruit
Join Date: Feb 2000
Location: newton, ma, usa
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I would be interested in seeing this. I would like to keep this machine going but I don't want to put too much money in to it.
Thanks
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Fresh-Faced Recruit
Join Date: Feb 2005
Location: St Andrews, UK
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The power supply from my Gigbit Ethernet G4 is very noisy and is probably going to fail in the near future. I have problems starting the computer sometimes and have to reset the PMU. I would also appreciate a guide to converting an ATX power supply.
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Mac Elite
Join Date: Mar 2001
Location: Madison, WI
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Moderator 
Join Date: Apr 2005
Location: Cambridge, UK
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Fresh-Faced Recruit
Join Date: Feb 2005
Location: St Andrews, UK
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Many thanks for the guide. I think the Gigabit Ethernet G4s also have a 22 pin connector so I am presuming the procedure would be the same.
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Dedicated MacNNer
Join Date: May 2004
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yup, you wont go wrong with that. as long as you don't need to power a ADC display.
I've done ATX convertion on B&W G3 & Sawtooth. All working fine till today.
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Moderator 
Join Date: Apr 2005
Location: Cambridge, UK
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Originally Posted by shawp
Many thanks for the guide. I think the Gigabit Ethernet G4s also have a 22 pin connector so I am presuming the procedure would be the same.
I'm not sure. You'd have to find the pinout and check it before you attempted this.
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