Homebrew PC from years ago. Gigabyte GA-990xa-UD3 mobo with AMD FX-8350 processor and 16 GB of RAM. SSD for OS and apps. GPU is NVIDIA GeForce 1060 w/6GB. Two more HDDs for video, docs, and pics and an external 6TB backup drive. System would halt while I was editing videos for my choral group. After several weeks, I figured out that it was getting too hot. Both of the case exhaust fans were failing/failed. Tried running it with the case open, which made it better. Fans came in from Amazon, and I got them installed. Not much help. Video editor app still runs the processor temp right past 80C. I pulled the heat sink off and applied boron nitride paste. No help. Any ideas?