two days ago, my computer (dim8400) booted inproperly. after the dell screen, the monitor was on, but stayed black, i.e. no windows xp loading screen. it stayed that way for a few minutes until i shut it off manually because it obviously refused to boot. i then turned the comp back on, and it asked to me start windows normaly because it wasnt shut down properly, etc. it did it twice yesterday, and once today. any ideas? thanks