Hi Tim,

If your PC is unexpectedly getting shut down, it's almost certainly overheated. The PC, which monitors the temperature of the CPU, is protecting it's delicate circuits from the ravages of heat.

There are ways of checking the CPU temperature including the utility SpeedFan. Software like SpeedFan can be downloaded to help gauge the temperature of your computer in different areas by monitoring the sensors. Cooling pads can also be purchased for laptops.

This can happen for several reasons like your computer’s case may be full of dust, a fan may have failed, or something may be blocking your computer’s vents.

You can try the below steps in order to make it work properly:

• Make sure nothing is blocking the PC's air vents.
• Unplug the PC and open it up. Use a can of compressed air to remove dust, especially around the fans and vents.
• While the PC is open, note the position of the internal cables. Are any of them blocking vents or air flow?
• Plug in the PC--while it's still open--and boot it to make sure that all the fans run properly. If one isn't spinning, try to find out and fix what's blocking it.
• Ensure Proper Ventilation: Put the computer in a location where it can properly ventilate itself. If it’s a desktop, don’t push the case up against a wall so that the computer’s vents become blocked or leave it near a radiator or heating vent. If it’s a laptop, be careful to not block its air vents, particularly when doing something demanding.

I hope this helps in fixing the issue.

Regards,
Lokesh