GA-MA790FXT-UD5P: Temp Readings.

[illogical]

Strange one this, but here goes anyhow.
Last weekend I fitted the Swiftech H2O Compact 220 Liquid cooling system to my PC.
Booted into BIOS to set the monitoring as needed, I.E. don't want the pump slowing down or stopping.
Everything worked fine, my Phenom II 955BE has been running @ 3.6 under a Zalman 9700NT, at 38 idle 54 100% load.
My 1st test run using Everest Stress Test, started at 32 idle after 1/2 hour doing not much, then under the test it rose to 43 Celsius.
Was I happy with that ? you bet I was.
Only ran that test for 20 minutes, then about 5 hours later after general browsing, 1 or 2 AVI conversions etc, the idle temp was about 34, so I decided to run the Everest test again.
This time the temp rose to 51 deg now not happy, almost as high as the Zalman.
OK by this time it was late so time to visit the land of NOD, I had downloads running so I set the manager to kill process's and  switch off the PC when done.
Fired up next day, everything is working fine but Everest reports CPU temp at 32 degrees and all 4 cores at 0, yes that's right 0 Zero!, run the stress test still the same all cores Zero.
Fire up AMD Overdrive,   it's reporting the CPU temp the same but core temps of - 256 degrees.  
I have now tried 5 different temperature monitoring utilities  and all report exactly the same 0deg C.
Yesterday for a brief 20 minutes it started to work properly again showing core temp 37 @ idle, I needed to reboot to update a driver and dam I was back to 0 again.

Anyone got a clue how to decide if it's a motherboard chip problem or the CPU diode ?
Everything is working fine rock solid stable.
Here's the url for anyone wanting to see verification;
http://img.villagephotos.com/p/2004-10/847577/AMDOD.jpg

http://img.villagephotos.com/p/2004-10/847577/Everest.jpg

[oggmonster]

Update to the latest BIOS and download Coretemp (am a bit of a coretemp fanboy ) you may also want to try using gigabytes temp moitoring software aswell to see what that says

[illogical]

Using F6 BIOS, which is the most up to date available, already tried CoreTemp, and a few others, even tried the monitor in SpeedFan, the 3rd I tried after Core Temp was the Gigabyte utility.
As I said before they all report the same, Zero, with the exception of AMD Overdrive which reports minus 256.

[oggmonster]

Could either be a problem with the motherboard or a problem with the sensor on the CPU. My E8600 has a problem with one of the sensors as one of the cores doesn't ever go below 37degrees even though the other core is 20 something degrees and at load both are totally equal temps. My money would be on the sensor on the CPU.
You could try clearing the CMOS as see what that does?

[illogical]

I'm going to make another partition tomorrow morning and install a basic XP Pro, with no other software other than CoreTemp, I'll remove the CMOS battery overnight 1st.
I'll post back and let you know if anything changes.
Thanks for your interest in this.

[Badbonji]

Looks like the CPU has some stuck sensors, or falsely reporting them. I am not sure if there is much you can do unless the problem is something else.