Rebooting every time during startup

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Any advice appreciated on this one!

A work colleague has brought his PC in for me to investigate a prob he has. Basically it reboots itselfs *every* time during startup.

SYSTEM:
Bespoke build (from a local shop)
ASRock mobo (onboard sound/video/NIC)
Pentium-D 2.80GHz
512mb RAM
2 x HDD
1 x CD-RW
Windows XP Home

DETAILS:
- WinXP appears to reach a file labelled kmxstart.sys then reboots.
- Same happens if I try to boot into Safe Mode
- Same happens if I select 'boot from last known good configuration'.

If I log into Recovery Console from a WinXP CD, it shows the two hard drives (WinXP sitting on drive D: oddly, but system also definitely booting from this drive too).

CHKDSK /p on both drives found problems and fixed them. But reboot yielded exactly the same problem.

I am currently installing XP onto a spare HDD I have installed into the box, for testing the system, and it's been on a good hour now and no reboots or anything odd happening, so I currently think it's something to do with a corrupt file on the WinXP drive.

Ideally I need to see an event log for the boot-up process but I'm not sure if this is possible?

Or can anyone recommend the best way of rebuilding this WinXP installation without jeopardizing/deleting the 3 users accounts currently on the drives (drive D: in particular).

Thanks for any advice in advance.

.

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