I have a mid 2007 2 GHz Intel Core 2 Duo iMac with 4GB RAM. I'd thought i would share some issues i have been having after installing Lion. Nine times out of ten when i start up my iMac I have issues with the Magic mouse. The bluetooth keyboard seems to connect ok, but in order to get the Magic mouse to connnect i have to slide the button on and off. Frustrating having to do this everytime the computer starts. Another issue I was having was a checkerboard effect on the screen at somepoints. Twice the computer has crashed with a checkerboard effect on the screen, allowing me to move the curser, with a huge pixel block attached. I have uploaded a video, showing the problem here: http://tinypic.com/player.php?v=nzixcz&s=7 Another pixel / graphic issue i have been having is sometimes the scrollbars render as a black mess / fuzz. I though my graphics card might be on the way out?? I ran the hardware test, but no issues were listed. Has anybody else faced these issues with Lion?