I'm completely out of options and answers...here's the story:
For about 8-10 months after I installed a new IBM Deskstar 103 GB hd on a P3, 1.4GHz system with 256 MB RAM and W2K Pro, I would get an "inaccessible boot device" error when booting most times. If i just reset once, twice, maybe three times, it would boot fully and operate fine. So I spent little time trying to solve it. I believe that I had actually attributted it to my tape drive incompatibility (in retrospect, that makes NO sense...like I said, I spent little time t/s'ing it) and moved on with life.
Fast forward to several days ago...in the process of handing down my 1.4GHz motherboard to my kids and installed a new 2.4GHz, P4, 512 GB RAM m/b in my system. Tried to fire up the thing with the old 102 GB h/d and I get the same "inaccessible boot device" error, only this time it will not clear, no matter how often I reset. I tried running AV routines, FIXBOOT, FIXMBR, disabling the IDE driver, repairing the Windows installation through the Windows recovery console (error: could not find NTLDR...perhaps a clue?), all to no avail. I called up Hitachi (they took over IBM's Deskstar line and support) and all they could recommend would be their fitness test app. I ran that and the drive is fine. I've done CHKDSK and frankly, I'm out of ideas. I'd like to keep from just wiping the drive and starting over. I know i may have redered my data inaccessible by using FIXMBR, but that was the last thing I tried, so maybe I screwed the pooch anyway.
I'm loathe to Microsoft, as I've had a few BAD experiences with their tech support geniuses.