HELP - XP SP2 Hangs on COLD BOOT (Sorry, LONG)

So I updated my XPH machine to SP2. It seemed SLOOOOOW, particularly in
Windows Explorer when changing directories, but it basically worked for
several days as my file and print sharing server, however, I leave it on all
the time. I thought that maybe the slowness was a garbage collection
problem, so I shut the machine down and powered it back up. Gets through
POST fine to the windows loading progress screen and the scanner stops after
1-2 repetitions. It will only start in safe mode, and System Restore to a
point before SP2 install did not solve the problem.

After a lot of research on here and in the KB, discovered potential for a
outdated BIOS. I am running a P4 2.6G, 800 FSB, 512 L2 on an ASUS P4P800VM.
My BIOS was 1005. Asus says my CPU needs at least 1007, and that I must load
1008 before going any higher. So I loaded 1008 and the problem was solved,
i.e. I could load and run XP SP2 again. I had some printer problems (HP
Photosmart 1215 on DOT4 port) so I loaded 1016 (the latest non-beta) with the
recommended loader (AFUDOS 2.7). When starting up, I got a time not set
error. Setting time would not take. I went back and got the latest version
of the loader (AFUDOS 2.11) and reloaded 1016 BIOS. Clock now OK, system
will start again, but when I cycled power, it locked again.

I have an alternate boot configuration with a different HD. It is XPH, but
has not been "upgraded" with SP2. It loads fine except it can't find the
printer either. It tolerates cold boot.

The non-working configuration is on a new 200G hard drive that I bought the
first time I saw this problem, about 6 months ago. I found some bad sectors
on my 40G HD. I thought that was causing the problem so I bought the 200G
and it seemed to clear it up, but I hadn't loaded SP2. Now, without SP2, the
40G drive is working fine.

I can't seem to find any BIOS that will make this configuration run with
SP2. HELP?!?!?!
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Thanks for any help,

Al