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it crashes after about 5 minutes on it turning on.
You say crash, which normally means a blue screen of some sort. Are you saying that the machine just freezes up and fails to respond to any keyboard or mousing actions?
Or does it shut down, or reboot?
Do you have access to another machine? I'd suggest getting hold of a bootable CD with memtest86+ on it (nearly any Linux distro has this on their live CDs, or download from here) and give that a go.
Erratic freezes such as this suggests a hardware problem, and since you have already tried replacing the hard drive, the memory is the next likely candidate.
.. i already have a copy of knoppix live with this have it on?.. if not i will download memtest86+ cheers for the help ..