After a clean install of xp pro sp3 computer was switched off and back patted.Next day fitted a western digital harddrive only forty gig and now computer wont stop beeping and no harddrives to be seen. Have tried harddrives cable select , slave , master, no jumper ,single harddrive and the best computer can do is count ram memory and ask for some floppy diskette which ive never had.Even shoving the operating system disc in only goes to the three choices and then it wont do anything except beeep continuously.I'm stuck and computer is by window and putting it through it looks likely.If anybody could offer a few tips ,secrets or knowledge I would be very grateful