Since the OS is WinXP, it could be the hard drive has failed. Another possiblty, since the model number is not listed, is there is a media in one of the drives. This could be a DVD, CD, floppy disk or media card left in one of those devices by mistake. Most likely, on a PC old enough to have WinXP, it is a failed hard drive.
I'm not an HP employee.
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