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- Stop Overclocking your CPU.
- Make sure your Heat Sink is placed properly above the processor.
- Clean the Processor fan, Heat Sink and other peripherals.
- Use High Speed fans.
- Use CPU Heat Sink Paste in the processor.
- Fix OS registry with reliable program like I always use Reginout.
- Shut down your computer at least two hour a day.
Have you checked the fans? Most desktops have a fan on the rear near the power cord thats part of the power supply, and a 2nd one on the CPU. You should feel air moving or be able to see the fans running (flashlight might be helpful). Sounds like a fan isn't running and the system gets hot after 5 min and shuts off. You should be able to remove the side cover and turn it on and see if the processor fan is running. Computer stores will have processors fans, power supply fans are usually not replaceable and you'll have to replace the whole supply.
first shut down you computer remove the covers of the cpu then locate the memory and remove them wipe them clean with clean cloth and switch the computer on with out the memory and see if you hear any beeps if you hear beeps insert the memory and switch on the computer if still no beeps then remove the processor fan and clean the surface of the processor fan and the processor apply a thin layer heatsink solvent and clip the processor fan tighty to the socket
Sounds like improper contact with the cpu and heatsink. If the fan runs...it runs and it'll do it's job but if the contact isn't proper, it'll overheat. These are older machines and the thermal paste that Dell uses turns to power after hundreds of power cycles. Buy some cheap silicon based thermal paste, clean off the cpu and heatsink with some 90% ir greater iso alcohol and apply a small rice grain sized drop of paste on the cpu. When you install the heatsink, give it a couple of twisted to spread the paste out.
OC failure = over clocking failure. Make sure the CPU fan is clean, free from dirt & dust. Check CPU fan plug is connected correctly. If the CPU fan still stops after a few seconds replace the CPU fan.
It's harder to find just a fan to fit your heatsink, which sits on your CPU. It is easier to find a new heatsink \ fan combo for your Intel. Use your manual to find what Intel chip is on your board. Use that information & search google for a heatsink & fan combo. Pay close attention to how your current heatsink is mounted to the Gigabyte board.