a p75 is a much older design then todays PC's . your p75 probably cant see a HD larger than 2 gigs.
1st you need to try and get an updated bios for your system, its specific to the motherboard maker - find your manual and find the maker for the m-board.
2nd, that might not help if you have a new ATA 66 drive, it is going to need a ATA 66 card & bios combo. if you have a comp-USA in your town they sell the ATA 66 controler cards for around 50.00 , if no compusa, I recomend CDW. www.cdw.com
If the BIOS sees the drive ok then its fine.. and not to mention its a 340meg drive.. i dont think it is ATA66 or too big .. Even if it was an ATA66 drive they are totally backwards compatible with ATA33 and PIO if need be.
Im guessing there isnt a partition on the drive to even format yet.. or the partition isnt FAT16 or FAT32.
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