Originally Posted by KellionBane

It looks like he's got a socket 939 board... And its pretty old... I'd say at least 6-7 years old. He most likely has an AGP or its onboard video. It is a Compaq after all.

And if he goes overboard with the graphics card, he'll need a new PSU.
Changing the CPU is out of the question, they don't make CPUs for that board anymore. Unless he buys something very old, but why? Its already a 2.4ghz.

How much ram does your system have?