will not load windows xp, continual loop

hello,

i am running win xp on my imac a1224, the one with the solid aluminium body.

the Mac osx operating system works without a problem, it is only when i go to use windows that this loop thing happens, no matter what option i choose to load windows i.e safe mode, safe mode + networking etc i get a very short BSOD and the computer reboots.

on thing i have noticed is thtat i can hear two sets of clicks that are about half a second apart whist at the Windows xp Load screen.

any help would be greatly appreciated