Yesterday my system shut off because a box was blocking the PSU exhaust, so it overheated. I took the side off and let everything cool down, and got some big wads of dust out of the bottom of the case. Now my GPU fan won't run. Radeon software shows 0 RPM, and a visual check shows that it's not moving. Nothing on the card looks burned or broken. I uninstalled and reinstalled the software, took the card out and put it back in twice, still not working. This is a pre-built low end "gaming" desktop. I don't overclock or use any manual tuning. Does this mean that the fan is just toast and I need to get a new one? The card works fine, except if I do any gaming it heats up to 90 degrees within minutes.