I tried posting this in the MBP forums and got nothing, so I thought I'd try here. Here's the old link, but I just copied the stuff I put in the thread over here: http://forums.macrumors.com/showthread.php?t=984023&highlight= I currently have a MBP1,1 running 10.6.4 on an external monitor with the ideal resolution at 1920x1200. From time to time, when I wake my MBP from sleep through external keyboard/mouse to have it run solely on the external monitor, it sets the display at 1600x1200, so everything seems squished vertically. After a fresh reformat, the problem persists, though it is less frequent. It's just a minor annoyance that I can't seem to find a solution to fix permanently. I usually have to go to safe mode and adjust the resolution back to normal. Alternatively, only sometimes if I put it back to sleep and wake it up again with the external keyboard, it will detect the right settings. Has anyone else experienced this or know a solution? Thanks!