tixsao

Turns out it must have been the thermal paste, installed a new heatsink and now temps are not getting much above 70 degrees even under heavy load. I presume it degraded over a couple of years Thanks for your help all

Thanks i will give it a go. The original problem lasted a few days before i tried removing the heatsink though so not sure thats the original cause

Hi, I have a self build PC which is now just over 2 years old. About a week ago it switched itself off while i was gaming. This started to happen more and more often since, and now the PC wont stay on for more than 10 mins. After a bit of research i am pretty sure its the CPU overheating. I installed some temp monitoring software and under load the temp is hitting 99 degrees. In the BIOS its showing as 98 degrees. The lowest i have seen it go in 2 days is 55 degrees. I have an i5-750 and am using the stock heatsink and fan. I took off the heatsink, cleaned the dust off which has made no difference. I am not sure how you tell which one of the two is the problem, CPU or heatsink.