I was standing beside my notebook PC when the screen suddenly went blank. I thought it odd that the screen would blank when it was still on, so I attempted to reboot. No luck. The lights come on and it sounds like it accesses some internal components for a brief moment, then the fan kicks on, then nothing. The screen never flickers, no beeps, nada. Ctrl+Alt+Del won't force a restart. I'm running XP Home edition (but it seems like a hardware issue to me). How can I diagnose the problem? Is it the screen, or do I maybe have some other pesky problem like a failed power supply? Any consideration given this matter would be greatly appreciated.