My guess would be that the RAM is not inserted all the way or is the wrong kind of RAM for the computer.
I would take out the new RAM to make sure that none of the original components (motherboard, other RAM, etc) arent damaged.
Then, if it turns out that the original stuff is fine, then find out what RAM it is and compare it to the stuff you already have.
Intel E6750...........PSN: ELBATROP
XFX nForce 650i Ultra
Patriot PC2-6400 8GB (4x2GB)
36GB WD Raptor
Samsung SyncMaster 931c
Samsung SyncMaster 750s
Windows 7 Home Premium 64