I just received my unibody 17-inch MBP Friday. After I switched to the discrete graphics card I stared to get lines of green pixels flickering on the screen. I have tried logging out and back in. I tried switching between graphics cards. The 9400 works fine but as soon as i switch back to the 9600 the flickering pixels come back. Restarting helps but they come back. I have all the updates loaded. Does anyone else have this problem? Please look at the picture and let me know what you think. This computer was a replacement for a broken late-2008 MBP. I'd hate to have to send this one back too.