Last week I asked the computer engineer guy who assembled my PC 1.5 years ago to upgrade the GPU from 9800gt to gtx470, because I felt it bottle-necked the other components. Since the change the computer has lost it's stability:
-As soon as Windows Experience Index test reaches DX10 ALU Assessment, system reboots.
-In some games the system overheats and reboots.
-Recently & occasionally a BSOD shows up on log in saying IRQL is not less or equal then it reboots, same thing happens somethimes when trying to install programs but instead of 0x0000000A, it refers to 0x000000D1
-BIOS hardware monitor and SpeedFan 4.42 (TM) say +12V is 0.00V, CPU is -31C and MB is 127C
What is going on? the guy says MB drivers are out of date, but I don't think that has anything to do with freezing CPU and melting MB. Please help me!
Intel Corei7 920 @ 2.67Ghz CPU
Asus P6T SE MB
Inno3d Nvidia Geforce GTX470 GPU
PSU idk but about 600W DC out based on multiplying and adding V and I values written on it's side
3x2GB 1333Mhz RAM
No unconventional cooling, just fans
If that's the only change you've made to your system, and you're not OC'ing anything, I'd initially be inclined to point the finger straight to your new video card.
127C anything in your PC is too high! This in combination with the CPU showing up as -31C plus 0.0V on the 12V rail means something is jacked up with the sensors. Or the added draw on your 12V rail is messing everything up? When you put the 9800gt back into the PC, does it work just fine?
I'd be inclined to think you have enough power, though does your power supply list the amps available on the 12V rail? Some less-expensive power supplies have strange combinations of wattage over the various rails.