Hey, so I went through the process of cleaning dust out of my computer this evening, and after I did so my fan became really loud instantly upon startup and after 1-2 minutes the PC would just shut off. I've been searching for a while, and it seems like I took apart the heatsink and didn't re-apply thermal paste but I'm not sure. When I looked up pictures of a heatsink, most of them are directly on top of the CPU, but all I have that looks like that is a filter-looking thing between two fans on the rear end of my case. Is that the heatsink? Furthermore, is the thermal paste the reason I'm encountering this issue? Thanks.