Hello I was dedusting my pc yesterday and my not knowing any better I removed my heatsinki, I put it back on (its firm and not loose so i assume i did properly) and im getting temps of about 50-60C stand by and 105C on bf3, will i need to apply more thermal paste or?
Firstly, you want to ensure that you remove all of the thermal compound from the CPU cap and the heatsink contact plate with rubbing alcohol.
Apply a pea-sized dot of thermal compound to the CPU cap, then carefully press your heatsink straight down onto your CPU, so the thermal compound can spread evenly. Do not lift up the heatsink at this point, as you will create air pockets which can dramatically decrease thermal transfer.
Lock down your heatsink and ensure that your CPU fan is plugged in, and you should be good to go.