Quote from MiniManOh dear god.
I couldn't get a picture but holy ****. The heatsink was just about sealed shut as was the video card fan. I cleaned it out and a huge dust cloud came from it filling my lungs. I blew the PSU out and it was like a huge jet of dust shooting out of it. By the time I was done I was covered in it.
Server SHOULD now never crash from overheating again.