okay, as the title says, this is a very weird problem. Before I start, here's the part of the system that you might want to know: GA 8IPE1000 P4 2.8 Pioneer DVDRW Sony DVD ROM 120GB Seagate Barraccuda (4?) SATA 200gb Maxtor Diamondmax (9 or 10) sATA This system works properly from the last change (6 months or so ago when I added the 200gb SATA). Yesterday I messed around my system software wise, trying to do something. And in the process, I physically unplugged my optical drives, both of them, via powerplug only (you should be able to tell what I'm doing). The comp works perfectly fine then. Even after a few restarts. Today, I decided to plug in my optical drives. Viola! My comp won't start, givine me a message right after "Boot from CD ROM:". The message reads: Couldn't open drive multi(0)disk(0)rdisk(0)partition(1) NTLDR: Couldn't open drive multi(0)disk(0)rdisk(0)partition(1) This came out even after restarting the comp a million times. Not literally of course... Unplugging the optical drives fixed the problem. Not sure of what the problem was, I just decided to mess around in BIOS, and found: IDE Channel 1 Master: Manual I obviously didn't change that, so I just changed it to Auto. Its fixed now, but to prevent future problems (this was a big fkin scare to me) I just wanna know, what happened?!? And is there a way to prevent it from happening (other than NOT doing what I did yesterday)?