Today, tried to upgrade my ram to 8gbs of ddr2 pc2 6400. The ram is compatible, im using 4.gbs of it right now to boot. The pc seems to not boot into windows 7, Boot into the Setup disk or startup repair. I have tried with 6gbs installed but it freezes. My motherboard is the Asus Benicia. I know its not a hardware problem since all slots work and all ram works.