Hello, I've recently upgraded my Macbook Pro with 6GB of ram (went from 2GB - 6GB). Since the install, my computer quits programs and often gives me the black shut down screen. Sometimes after the crash, the computer will beep and get stuck in the silver loading screen prior to boot up. Other times, it will take me to the log in screen just fine. When I reinstall the two single GB ram, my computer doesn't have any problems (albeit less memory). Activity Monitor doesn't show anything extreme, yet the computer crashes. I've ran several tests, and everything seems to be installed correctly. What else can I do to figure out what the problem is and get my computer stable? My computer: Snow Leopard, 10.6.3 2.4 GHz Intel Core 2 Duo 6 GB 667 MHz DDR2 SDRAM Mid Summer 2008 Model Thanks in advance.