If your hard disk is not being detected then that almost always
indicates a hardware problem, either with the hard disk itself or with
the hard disk controller chip on the motherboard. If the problem
persists you should probably take the computer to a repair technician.
As for the Blue Screen, what was the exact error message displayed on
it? There are tens of thousands (at least) of different possible blue
screen error messages that can be produced by Windows XP and the vast
majority of these all have a different cause and therefore a different
cure.
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