On Jan 3, 2013, at 8:31 AM, Cameron Kaiser wrote:
What's the chance that the following (basically, deep clean the
machine) might solve the high temperature problem?
It's what I would do next. Also reapply the thermal paste, and then
run
ASD thermal calibration to make sure it's properly reset.
Hello All:
I'm sorry this hasn't been stressed enough. Coolant leakage and low
coolant is a common problem with these systems. This is STRONGLY
indicated by the temperature readings on one CPU and by the
temperature at shutdown. One CPU reading is FAR too hot, the other is
far too cool. Something is definitely wrong with the cooling system
or the temperature diodes.
IBM gives a maximum operating temperature of 85 degress C for these
CPUs. Apple has an onboard shutdown around 74-77 degrees.
I have taken my air cooled dual G5 CPUs off three times and while
tedious, it is not that hard. It may require slightly uncommon but
available tools. Please run Apple System Diagnostic 2.6.3 on the
system. Camerons' suggestion is an important part of diagnosing the
problem. You might be able to get the Apple Store or an Apple
Certified shop to do it for you. Barring that, take the side door
off, the plastic air deflector off, and put a piece of cardboard in
the same bottom slot that the small white reflector tape (on the
plastic deflector door tab) is on (to stop the full speed fan
behavior) and listen for signs of gurgling/air in the radiator and
tubes during startup.
If it needs to be taken apart, there are decent Youtube tutorials and
internet sites/pages referenced at Lowendmac and www.xlr8yourmac.com.
Maybe a Google search for "PowerMac G5 coolant problem" would help.
You might look for someone in your area who would help.
Ooops! Forgot about (don't remember), are all the fans spinning,
plugged in correctly?
Hope this helps.
Bob
PS If you want more information from me, please reply off list.
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