OT - Potential puter problem..what is this a sympton of?....I've had some weird sporadic puter problems on boot of computer. First, it started up with win.com not found(already posted this in hardware forum). Now sporadically when it boots it stops with a black screen & blinking cursor. Once I shut down & re-boot all is okay. Now, I ask, what is this a sympton of...do I need to get this machine to a repair shop immediatley???? WinXP Pro(SP2)...NO viruses etc. Already did defrag. TIA :)