Computer Constantly Rebooting

Hi, I'm new here.

Really hope to get some help on this issue with my PC where it's stuck in a rebooting loop everytime I turn it on.

The thing is though - the longer I leave it off, the longer it stays on before constantly restarting again.

If I left it completely turned off for a month, it'll boot up fine and stay on for 2-3 days.

If I leave it off for a week before turning it on again, it'll load up fine and stay on for like 12 hours.

So the amount of time I leave it off is directly proportional to how long it'll stay on - just mentioning this in case it's an indicator of a certain faulty part.

Would really appreciate any help! Many thanks!

P.S. I read online this has happened with people after a Windows update and I made sure last time my computer was on that I updated it fully with every latest Windows update in case there was a patch released.

 

I would be tempted to check for overheating- and cleaning out with a paint brush/small hoover, in case

 

Hey baklogic, thanks! I'll have a look and try to check that for myself.

Appreciate your response! Cheers.