OK so I'm trying to upgrade my PC with a better processor. It is working fine with my AMD Phenom X4 9650. But when I change it to a AMD Athlon II X4 645 it just doesn't want to boot up there is just a black screen and then the monitor goes to sleep. Ive been researching and the seller of the processor tells me that I might need to upgrade the BIOS but the thing is I can't find the update for my motherboard. Any suggestions? Much appreciated.