power mac g5 quad cpu runing hot

ok my power mac g5 quad the top cpu core 1 and 2 are runing really hot and ween itryed to turn it on this moring the fans all went to max and shut off i then tryed to trun it on again and it just went 'click' and i unpluged ever thing left it alon and came back about a hour later and tuned it on and ween it got to the main desk top the fans were on max and the top cpu cores were about 155f 165f and the outher cpu was runing fine what could this be a computer guy told me this could be that i need new thermal paste pleassss help

PowerMac, Mac OS X (10.5.8)

Posted on Jul 16, 2012 10:34 PM

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10 replies

Jul 17, 2012 2:55 AM in response to taylorfromvidor

The thermal paste degrades after 3-5 years of use.

Whether anyone wants to or not, the thermal paste in ALL G5 machines needs replaced.


LCS systems, even without leaks, can have reduced performance due to sludge buildup or loss of volume due to evaporation and escape of those liquid vapors.


Serious consideration should be made towards rebuilding the LCS for longevity of the computer.

Jul 18, 2012 11:46 PM in response to japamac

thank yall so much i got the g5 in a computer shop geting thermal paste on it and if dont work im going to part it out and sell it what imac,s and mac mini,s do i need to stay away from like i know the white imacs had alot of motherboard fails so if you could just tell me what imac,s to not buy that would help alot and thank yall for all of yalls help

Jul 19, 2012 11:20 AM in response to taylorfromvidor

On Minis, I'd only buy the current mid one with a real Video card.


On iMacs, besides the one(s) you mentioned, I'd be afraid to buy a 27" one myself, I'd recommend maybe a 24" one, but they're limited to 6 GB of RAM, I'd like one that could have 16 GB of RAM to be able to handle all of today's bloat.


I personally would not want an iMac with any nVidia graphics or an ATI X1600 either.

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power mac g5 quad cpu runing hot

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