Normally when I shut down my computer I'll get a black screen with a little white underscore blinking in the far top-left hand corner. After this I'll get a message "It is now safe to turn off your computer" and then the computer turns itself off.

The problem is that every single time I've shut down recently, the underscore has moved from the top-left hand corner to somewhere in the middle around the bottom-right hand side of the screen. The screen stays that way, with the underscore still blinking, and fails to shut down at all unless I hold down the power button. I'm using Windows ME, and I realise how crap it is but I'm pretty much stuck with it. The computer's been fine before this.

Anyone have any idea how to resolve this?