i have a dell deminsion 4550 i was given. it has a pentium 4 2. 4GHZ sounded like a good machine. nut it's not i wanted to put in a newer hard drive with xp pro just like the original and it won't boot. the original was 30GB the new is 40 (40 the max for the machine?) the origanal is from 2002 the new from 2005 both maxtor diamond max 3.5 series. there online support for sayed it wont work. i know i tried but this is wired becuse almost any other computer you can put in a hard drive and it will boot. any ideas of how to make this work. thanks