Turning off the computer without warning

Turning off the computer without warning

Computer shuts down could be triggered by a number of things. The most common is faulty fans that are causing the processor to overheat beyond acceptable limits. The first thing to do should be to open the casing of your computer just after it shuts down, (remember to disconnect from the main power before opening the inside of your computer) and remove the CPU Fan and heat sink and feel whether the heat sink is actually hot, you may also try and feel the processor before removing it. If indeed the processor is hot, try cleaning the heat sink off any dust and all dirt.

Also, check whether the processor fan rotates when you spin it with your fingers, (normally, the fan should rotate for up to 20-30 seconds before it stops). If your fan doesn’t rotate well and is sticky or hardened with little or no movement at all, you can either clean it as well or replace with a new fan.

To clean, you simply apply some WD40

Or any multipurpose lubricant oil – (the kind used in sewing machines, bicycles, etc.) by removing the label and a plastic cap that covers the spindle hole. Apply a drop or two and leave to dry or wipe excess liquid with a piece of cloth. Also clean all computer openings and make sure that there's room for air flow in your machine.

Cleaning all other openings, including the power supply unit and its fan can also reduce the risk of overheating and unnecessary shutdowns. 

Regards,