Recently I bought a new video card that has ddr3 memory and my main memory is ddr2, the salesman told me it didn't matter. When I fired it up I ran a test on pc doctor and it locked up half way through. I rebooted went to you tube and an a game trailer to see how the card would keep up, after a minute the card locked up, the audio was chattering. When I restarted I got a bsod and 5 different codes. It starts in safe mode, but will not start normally. I disabled video driver reset default values in bios and still can't start normally. Anyone have any ideas?