So as an update the new and old RAM stick are double density which is what the motherboard specifications say it should have, as far as i can tell it should be compatible with what the motherboard ram support site tells me (takes 800 Mhz DDR2 RAM which is what the RAM stick is), I couldnt find the ECC/non ECC thing that was talked about in the first comment.
Is there a special way to install RAM or is it as simple as making sure that the computer is unplugged, put the stick of RAM into the slot and then start the computer back up?
If there isnt a special way to instal RAM then I'm pretty sure the stick is faulty.
Thanks for the help so far guys! I really appreciate it