My computer won't even show the POST screen!
When you press power, it does a single beep (Like normal), then sits at a blinking cursor in the top-left corner of the screen!

It used to be that it would just sit at POST with a blinking cursor, but now it won't show any signs of POST.

I really hope this is a PSU problem, because my current one's fan just crapped out on me, and I'd rather just replace the entire thing than crack it open and replace the fan, but if it still works, I might have to

Please help!