Old system / background:

HP Compaq Presario S6700CL WinXp Pro - purchased in '05
Motherboard dies in May, placed entire system on shelf, to collect dust.

Last week, my son and I decide to rebuild it using a brand new
ASUS K8V-MX motherboard instead of the original ASUS K8N8X-LA.
The new board posts fine, recognizes all hardware.

The Hard drive from the old machine tries to load WinXp, fails, and system reboots. I assume because there is a bios marker not present, or incorrect.

Is there any way to work around and load the former WinXp, or should we simply wipe the HD and start over?