Try These Options
You have two HD's correct??
Is the other one installed and does it have an OS successfully installed on it?? If so, I would remove the HD without the OS on it, te one ou are having the problem, and take out both memory sticks, and install one back in, making sure in it in the correct way. Then boot the PC all the way up, and shut it down again, then power off, and install the other sitck of RAM, and boot up and shut down again, remove the working HD, and install the one you are having problems with, and try installing the OS, WIN XP on it again.
If it still doesn't work, remove one stick of RAM, if you have two, and try again, if this and the update to the bios does not work, then it sounds like the WIN XP cd is bad and has some corrupt files on it.
Your last resort here needs to be changing the cd and if the problems presists, it is most likely the HD or the motherboard.
I doubt it is the mobo, but you never know with these machines we are obsessed with, it could be anything.
NEways, this is what I suggests you do, hope one of these helps you, let us know,
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