I have an old PC that I was trying to add some more RAM to. Cpu is AMD phenom ii 840. MSI motherboard. I installed the new ram and it wouldn't boot. Took it out, booted up like normal. So, to see if I had bad ram, I took the old ram out and put the new in. FF error, no post. So I took the new ram out and put the old back in. Still same FF no post. Checked my connections, everything seems fine. What could be going on here?