I'm just making sure here, since you didn't mention it in your details,,,,, Are you applying a thin film of thermal paste between the heatsink and PCU each time you replace it?
And if you're overclocking your computer, the RAM settings in the BIOS or bad RAM can cause this issue.
And next, see both of the links below which discuss your issue:
Hope this helps.
I have an HP Pavillion with a phenom 925 quad core processor with 8 g of ram.
My computer shuts down at various times through out the day and sometimes it may not shut off at all during the day.
I have replaced the following:
CPU fan and heatsink twice in a year.
Re did the thermal paste recently
Replaced the hdd as I was getting an smart error when i ran looking for hardware problems
Replaced the power supply with a 600 watts which is a more powerful one than the orginal.
After this was all done, my computer was still overheating and the temps would run 55c tp 80 c.
Just recently I had the BSOD and was unable to restore to a previous version and the repair was unsuccessful. So I re-installed windows.
Initially after I installed Windows 7 the temps were running really low between 27-35c. But now the temps are 27c - 55c and it still shuts down
Every time the computer shuts down, Core Temp showed that my CPU was only around 50-60c and it is my understanding that my CPU is overheating at 70c.
And the computer still keeps shutting down periodically sometimes with no error and at other times it states it is shutting down due to overheating.
AMD Phenom II x4 925 processor 2.80 GHz
8 g ram
Windows 7 64 bit
1 tb hdd
2 dvd drives (1 internal and 1 external
1 external hdd
head phones and speakers
Power supply 600 watts
and a printer.
I run Nortons internet security which is running all the time
I play WOW on this computer but right now I am not able to since it can shut down while I am playing.
My daughter plays sims 3, mindcraft and likes to watch youtube videos plus club penquin and wizard 101.
I ran a diagnostics and it states the everything is working as it should including the memory.
my computer has been running with out the side of the case for a year now and I have cleaned out all the dust several times within the year.
Everytime I replaced the cpu and heatsink it seemed to work for the short time appox 6 months and then it starts acting up again.
The only thing that I can think of is replacing the motherboard. I was trying to find some software that can test the motherboard but have been unsuccessful so I am not sure if there is such a program. I also was looking for a program that will actually show the CPU temps when the computer shuts down as I leave core temps up at all times and I keep an eye on it and every time it shuts off it shows no more than 50c.
When I check the event viewer I get the following erros at time of shut down:
event id 41
task code (63)
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
If anyone can help, I would greatly appreciate it.