That's right - how did that happen?
Another link:
http://www.newegg.com/Product/Produc...82E16822136109
The latest BIOS for your computer is from 2003 - but it doesn't say if it supports 48-bit LBA (HDDs larger than 128GB).
http://h10025.www1.hp.com/ewfrf/wc/s...os=228&lang=en
A way around that (possible) limitation would be to get one, or more, 120GB HDDs (that would be faster too).
A controller card will bypass a LBA limit in BIOS as well.