Windows 7 - Sager NP9262: PC Won't boot, black screen, after RAM upgrade.

I just received a 4GB stick of RAM from amazon that I bought to upgrade my NP9262 from 6GB of RAM to 8GB of RAM. I bought another stick of the 4GB RAM that is identical to the first. It is Patriot 4GB PC2-6400 800mhz DDR2 SO-DIMM RAM. The NP9262 is supposed to support up to 8GB of RAM. After I removed the 2GB stick I had (which was Apacer, stock RAM and also PC2-6400) I put in the 4GB stick to make 2X 4GB Patriot PC2-6400 SO-DIMM DDR2 RAM, when I plugged in computer and turned it on it runs but just sits there at a black screen and does nothing. I called Sager and they said I should get 667mhz RAM, but everywhere I read said to get 800mhz, and I already had the same stick in there.

What is going on? Has anyone else had this problem and what should I do? Hopefully I can return to amazon if I have to, but it would be even better if there was something I could just tweak to get it working.