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iMAc G5 Fan Noise

Message #1 - Posted 2005/09/19 - MaskellMan

I have one of the iMac G5s that is in range of serial numbers that is potentially faulty. It hasn't actually failed yet. However, the fan noise is excessive. The CPU fan runs more or less continously at 5600 rpm and the CPU temperature is 65C under no load conditions and can rise to 87C. Before, I contact Apple, could anybody else tell me if these conditions are indeed unusual for the iMac G5.

Message #2 - Posted 2005/09/19 - Peter Ceresole

MaskellMan wrote:

I have one of the iMac G5s that is in range of serial numbers that is potentially faulty. It hasn't actually failed yet. However, the fan noise is excessive. The CPU fan runs more or less continously at 5600 rpm and the CPU temperature is 65C under no load conditions and can rise to 87C. Before, I contact Apple, could anybody else tell me if these conditions are indeed unusual for the iMac G5.

I have one of those (iG5 17" 1.8GHz), and those conditions are indeed unusual. I don't have any actual fan speeds or CPU temps, but most of the time the fan is effectively inaudible. The only time the fan kicks in is if, for example, I have Classic and Word 5.1a running. Occasionally Word can crash in the background and Classic grabs 60+% of the CPU. I can tell simply because the fans come on. Shutting down Classic cures it; within five minutes the fans are back to a whisper.

Have you tried running Terminal and using Top to see if any process is using unusually large amounts of CPU time?

Peter

Message #3 - Posted 2005/09/20 - whisky-dave

"MaskellMan" <doug@cs.man.ac.uk> wrote in message news:1127167874.945280.114520@g49g2000cwa.googlegroups.com...

I have one of the iMac G5s that is in range of serial numbers that is potentially faulty.

Where is this list ?

It hasn't actually failed yet. However, the fan noise is excessive. The CPU fan runs more or less continously at 5600 rpm and the CPU temperature is 65C under no load conditions and can rise to 87C. Before, I contact Apple, could anybody else tell me if these conditions are indeed unusual for the iMac G5.

A few months ago a friend had to send an imac 1.8GHz 17" back from repair as it kept restarting due to a T-diode problem.

One week ago I recieved my iMac G5 20" 2.0GHz.
and have been using these utilities
X Resource Graph 1.1 & thermograph X

see versiontracker.com

Which I've found very good even though they give slightly different results. thermograph X gives a longer term graph plot of the temperatures but no fan speeds.
I'm at work on a PC, and the macs at home,
but from memory my processor T-diode temp. was about 50-60C but... When running SETI 3.08 screensaver that hammers the FPU
I was geting 88-91C and the CPU fan speed went up from 1500RM to 2000+ HD temperature stayed about 40-54C most of the time.

Message #4 - Posted 2005/09/20 - Peter Ceresole

whisky-dave wrote:

I have one of the iMac G5s that is in range of serial numbers that is potentially faulty.

Where is this list ?

http://www.apple.com/support/imac/repairextensionprogram/

Serial Number ranges:

* W8435xxxxxx - W8522xxxxxx
* QP435xxxxxx - QP522xxxxxx
* CK435xxxxxx - CK522xxxxxx
* YD435xxxxxx - YD522xxxxxx

Thanks to Clive for the inital posting.

Peter

Message #5 - Posted 2005/09/20 - Jon B

Peter Ceresole wrote:

MaskellMan wrote:

I have one of the iMac G5s that is in range of serial numbers that is potentially faulty. It hasn't actually failed yet. However, the fan noise is excessive. The CPU fan runs more or less continously at 5600 rpm and the CPU temperature is 65C under no load conditions and can rise to 87C. Before, I contact Apple, could anybody else tell me if these conditions are indeed unusual for the iMac G5.

I have one of those (iG5 17" 1.8GHz), and those conditions are indeed unusual. I don't have any actual fan speeds or CPU temps, but most of the time the fan is effectively inaudible. The only time the fan kicks in is if, for example, I have Classic and Word 5.1a running. Occasionally Word can crash in the background and Classic grabs 60+% of the CPU. I can tell simply because the fans come on. Shutting down Classic cures it; within five minutes the fans are back to a whisper.

Have you tried running Terminal and using Top to see if any process is using unusually large amounts of CPU time?

Download Temperature Monitor to get your CPU temps, I don't know where he is getting his fan speeds from though. I'd be interested in CPU temp comparisons as ours runs similar to the OPs with often high fan speed sessions with a slow down in speed.

Jon B
real email to usenet at jonbradbury dot com

Message #6 - Posted 2005/09/20 - MaskellMan

Temperature Monitor is free - but only monitors temperature. Hardware monitor (and Hardware Monitor Remote) by the same author is shareware but reports all sensors - amazing number in a real Powermac G5 system!

Message #7 - Posted 2005/09/20 - MaskellMan

Temperature Monitor is free - but only monitors temperature. Hardware monitor (and Hardware Monitor Remote) by the same author is shareware but reports all sensors - amazing number in a real Powermac G5 system!

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