Need help, strange PC behavior, no go to desktop



Hi,
This is a neighbor's hp pavillian circa 2000 running xp pro on 20 gig hard
drive with 256mb ram and 4x optical. The button battery may be dead, not
sure. Will check it later.
Symptom: Boots to logon window, then when you click on acct name, it starts
to load xp and then reverts to the logon screen. Does the same in Safe
mode.
What I tried prior to this post:
pulled the drive and put it in test bed as slave and ran various anti mal
ware aps, virus and trojans found and repaired. Reinstall, same problem.
XP repair from install CD, after repair, hung prior to log in screen.
3 attempts at full install frm 3 different xp cd's. Gets as far as
finishing formatting the drive, then reboots.
From a dos prompt zeroed the hard drive with clearhdd.exe then installed xp
pro creating new primary partiton, etc., and after format: same symptom.
Tried with xp home CD and XP pro CD. Same symptom: reboots after formatting
c drive NTFS.

Its not power, it runs all night without getting hot, or rebooting.

At this point I'm at a loss, any ideas much apprediated.
Thanks,
Al


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