Also, what socket is your CPU? 478? A? 754? 939? 775?
What slot is your graphics card? PCI? AGP? PCI-E?
What type is your RAM? DDR? DDR2?
While those questions sound confusing, they're really not.
CPU- is it Intel, or AMD? What speed and type? you said 2.4, but is it P4 or Celeron? If it is AMD, a 2.4 translates into a 3400+ in a socket 754, or a 3800+ in a socket 939.
Graphics card- download and run Everest (you can get it from majorgeeks.com
). It should tell you. Or just open up the side of your case and look at it. PCI will be exactly like the other slots below it. AGP is normally brom and sits further from the rear edge. PCI-E sits further back, and is usually white.
RAM- Everest will tell you. 478, 754, and 939 all use DDR. 775 uses DDR2.