Today I tried turning on my desktop PC, and it got stuck on a black screen with a flashing underscore. After turning it off and on a few times, I accessed the bios and was able to boot from the boot menu. But the fan was louder and I smelled something burning. I used dust cleaner throughout the whole case and tried again. Same flashing screen, worked from bios boot up, same smell. I tied to isolate the smell and it seemed to come from the air being blown out from my graphics card. Any ideas?