I just bought a used MacBookPro 15" late 2008 for $850 (he was asking $1,000), it has 8GB of DDR3 RAM, a 250GB HD, and a 2.4DualCore, the Video Card (which I'm confused with) says there are two. One is an Nvidia GeForce 9400GT, and the other says its a 9400M GT. Both consisting of 256MB RAM. Does this mean i have 512MB? Another question, the screen seems to flash black with a large white streak every ~10m. Its intermitent. I also booted up and the screen didn't turn on, but the computer was on. It sounds like issues the GeForce 8600GT had. Any Suggestions or comments? Should I hurry up and sell before its completely shot?