G5 Possible issue with heat

Hi Guys,
I posted a couple of months ago about a problem with my computer. Took it in and had it fixed. Everything was fine until a very hot day a couple of weeks ago when I played a rather long game of civ iv and the machine crashed. Since then it has been quite volatile at crashing.
I believe that there is a problem with the temperature of one of the cpus. I have used both Temperature Monitor and X Resource Graph. X Resource Graph suggests that CPU A Die temperature is above 70 degrees celcius (about 155 F) and that the CPU A Exhaust fan is rarely going very fast (normally at 300 RPM and occasionally going to 600 RPM under heavy load) whereas the CPU B Exhaust fan is typically over 1000 RPM. Temperature Monitor on the other hand claims that the Die temperatures of both CPUs are around 50 degrees celcius but after turning off the computer and opening it up it was very clear that the top CPU was significantly hotter than the bottom CPU.
There is also notable airflow from the bottom CPU fan out of the case with very little from the top CPU fan.
Any suggestions? I guess my thoughts are that the CPU A Exhaust fan isn't working but whether it is the fan, the connection to the fan or the fan not being activated correctly.
Are there any fan control programs for the G5 so I could see if the fan was working?
James

Hi, James.
For the crashing, you could boot from the supplied system disc and and run Disk Utility > Verify Disk (and Repair Disk, if problems are found) on the internal boot drive
http://docs.info.apple.com/article.html?artnum=162662
If DU finds problems it can't fix then you could try Disk Warrior
http://www.alsoft.com/DiskWarrior/index.html
You will need to boot from the Disk Warrior CD or download and install it on another drive - and then boot from that other drive - in order to repair your boot drive.
Further solutions for crashing were covered in your previous thread.
For the fan problem, you could download and run Hardware Monitor
http://www.bresink.de/osx/HardwareMonitor.html
which has more functions than Temperature Monitor, and includes Upper and Lower Limits, where these have been specified.
It should be noted that on an 'Original' G5, OS X (and Hardware Monitor) report the fan speed instructions being sent to the fans, not the actual speed of the fan. On this Original G5 DP2, CPU Die Temps are usually within about 2degC of each other, and the Intake and Exhaust fan speeds (or, at least, the OS X-instructed Intake and Exhaust fan speeds) rise and fall in approximate unison.
Intake and Exhaust fans should turn continuously, not dropping below the Specified Lower Limit.
You could try running the Apple Hardware Test
http://www.thexlab.com/faqs/aht.html
and, if you have AppleCare, download, burn a CD, boot from it and run TechTool
https://support.apple.com/techtooldeluxe/main?id=dl
Apple-Certified Technicians can run a Thermal Re-calibration Utility - but this is normally used after CPU or logic board replacement.
Sometimes re-installing the combo updater helps
http://www.apple.com/support/downloads/macosxcombinedupdate1039.html
Please post again if you have any further questions. If you have questions about the way Hardware Monitor works, there is a Contact the Author option in the Help menu. Good Luck.

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