I'm a bit perplexed.

Old box that passes all motherboard diags, disk drive diags. Fdisked
and installed XP Pro. Reboot and it stalls. Error reading disk, press
ctrl, alt and del

The drive is set to active. Known good install CD. I've tried different
install disks. Slipstreamed SP3 onto install cd. Same problem.

NTLDR and Boot ini are good.

I'm perplexed.