I work at a computer repair shop and do 10-20 windows xp reinstalls on new hard drives a week... OEM, non-OEM, OEM copy on a different branded machine, etc etc.
I have never heard of a "hard drive tattoo". I certainly don't think you'd have any problem whatsoever just using a normal windows disk and your HP key. Like they said, the worst that will happen is you have to call Microsoft and activate it. Takes about six minutes. No sweat.
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