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Pc shuts down ,reason cpu overheating

My pc shuts down within 10 min of starting it.When i restart,i get a

message that cpu was shut down due to a thermal event.In case of games this shut down is instantaneous.

I opened up my pc to see whats wrong. I found out that the intake fan
wasn't rotating fast. I replaced it with my friends old one .the power
ratings were a bit different though ,the old one had a rating of DC
12v max .13A,the new one has a rating of DC 12v max 0.20A.The fan is
working properly.The problem still persists.I have even removed side
panels and am providing external cooling through a table fan.I also
cleaned my pc.

One more thing within 2 min of windows starting the pc slows down.its
like the pc hangs every 2 seconds for a second.After 5 min the pc goes off.

I got a core2duo 1.8 ghz. 1.5gb ram, 8800 gt graphics card.My motherboard is,Intel D946GZis


plz help !

thanks for your time :)

shreyas

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Since you have cleaned the inside thoroughly, could be a capacitor problem - replace capacitors.

It's also possible that there is a bad thermal contact between the NorthBridge chip and it's heatsink. That's the chip/heatsink combo immediately below the processor. Just remove the spring clip that holds the heatsink in place. Use a toothbrush and a good solvent such as denatured alcohol to remove the thermal pad and associated heatsink compound from the heatsink. Then remove all residual heatsink compound from the chip itself. Once everything is very clean, apply a VERY THIN coat of new heatsink compound to the top of the chip AND the bottom area of the heatsink where it comes into contact with the chip.

If this doesn't do the trick, you probably have a bad motherboard.

Posted on Jul 25, 2009

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You need to remove the fan and cpu heat sink, and clean and reapply heat sink compound. Put a thin layer on cpu then install heat sink and lightly push down and give it a little twisting motion to spread compound, install fan then clip down or clip then put fan on what ever your system requires.
Thanks for using fixya!

Posted on Jul 25, 2009

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Have your ever changed your Power Supply, if not then try to change or test any Power Supply available, why! Because it might be due to low power of your power supply, sometimes its does do that. Then you say all are being check, right! Your Motherboard, Fan is OK. And last thing is remove some devices that are still connected or any removable device on it. Good luck!

Posted on Jul 25, 2009

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A far more important fan is the one on the CPU itself ..

the differences between the specs on the fan you replaced and the original is insignificant .. that should be fine for a cabnet fan

several things can cause a thermal event ..
1. if the cooling fins on the CPU are clogged or its fan is not working
2. if the heat sink grease is missing or not used properly on the interface between the CPU and its heat sink ..or the heat sink is not mounted properly

since your system is shutting down so quickly i would suspect the second case above ... i would remove the heat sink from the CPU then clean both surfaces and reapply a recommended heat sink interface material ... i use a silver bearing grease .. careful not to use too much .. remount the heat sink and make sure its not being held up (or interfered with) by some other component ..make sure its square and in good contact against the CPU (not cocked) .. make sure the spring that holds the heat sink in place is latched at both ends ..

Posted on Jul 25, 2009

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It seems to me that your pc is facing hardware problem.It is suggested that you contact local computer service to replace the faulty hardware..

Posted on Jul 25, 2009

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In the bios Disable "CPU Fan Control" and "System Fan Control". I had the same problem with the D946ZIS motherboard. When those 2 features are enabled the fans slow down after startup and the CPU overheats forcing the the computer to shutdown. Once I changed both those settings to disable it never shutdown again because the fans operate at full speed.

Posted on Oct 30, 2012

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