There is another sneaky little feature which I have just run into on an ASUS motherboard and Win 7, which has just cost me at least two hours frustration.
Having arrived at the blank screen with the blinking cursor, like Pixelvoxel above, and rebooting and tapping F8, this sometimes brings up a screen headed 'Boot choice' or Boot options' or something like that anyway. On this computer, which has two DVD drives installed, it offered a sequence DVD drive (1), Hard drive (1), DVD drive (2). Mistaking it for the boot priority sequence, every time it came up I clicked on DVD drive (1). Return of flashing cursor.
It was only after I had taken a break it occurred to me to try something different - click on 'Hard drive (1). And lo ! Win 7 went and installed itself as though there had never been a problem. Just the small matter of a couple of hundred updates + a complete software re-install. Never mind, at least the (expletive deleted) thing is working.