After my "new" MB for my server was DOA (a different thread), I put my worksaation back on the desk. I had not removed or changed ANY components. All I had done was pull the power, mouse, kbd and nic cables so I could use them on the newish box. I boot the beast and leave the room to errrrr, freshen up. I return, and he damn thing is rebooting. I seems that windows had a mini-stroke. Linux still boots happily, as does Win98 (multiboot is GOOD). Even Win2k would boot in safe mode. After countless iterations of booting, changing CMOS, removing hardware and letting Win2K clean itself in "safe" mode, it still refuses to boot.
After enlarging my bald spot, I booting into the recovery console. One chkdsk /p later -- all is well, or at least booting. Why exactly did the system never worry about disk issues? Not really asking, just