On Jan 5, 2013, at 5:03 PM, 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.
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.
The quad G5 has a much lower rate of LCS failure or compromise than
other
liquid cooled G5s. If it were, say, a dual 2.5 like my folks', I agree
I'd check the LCS first. But on this quad, I'd do the clean-up and
thermal
paste renewal first because you'll have to do it anyway, and it's
more likely
to be the issue. For relative failure rates, see this handy table:
http://www.macintouch.com/reliability/pmg5.html
Of the three quad G5s I have personally owned, none of them had an
LCS issue.
The one that's "dead" fried its logic board for some other reason,
and the
other two are still going strong.
On third thought, I agree. I think I would pull the CPU heatsink
cover and see if the heatsink(s?) are loose with _very_ gentle side to
side and up and down tugging. However, having just looked at this web
page about disassembling a quad core heatsink "http://www.xlr8yourmac.com/systems/G5_CoolantLeak_Repair/G5_CoolantLeak_Repair_p1.html#storytop
", it is indeed more involved than my teardowns and rebuilds on my
G5. However, if Bill can replace a motherboard or CPU and heatsink,
he should be able to do this, with research on the web.
I do urge you, Bill, the same as others here, to give it one last try
before you give up on the G5. The Mac Pros have their own problems.
Not that they are bad, just a different kettle of the same fish.
Bob
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