you said you installed xp to it from the desktop?
if so various things are wrong,
1. windows xp thinks it's on a different drive, so the loading program can't find anything,
2. there is no loading program because xp may not have installed it on that drive,
3. xp is setup for the wrong hardware profile
do you get any prompts at all, or just a bios prompt, then a blank screen?
(if you remove xp and installl lin it will work)