In this how to video, you will how to remove the logic board from the iMac G5. First, get the t6 screw driver and remove the screws in the corner. Unplug the airport card. Now, unplug all the cables connecting to the logic board. Now, unscrew the torx screws located on the logic board. Unplug the optical drive cable by unscrewing the 2 torx screws holding it. Next, unscrew the torx screws located near the center top of the board. You can now remove the logic board. However, there is a hard drive cable that you must unplug before completely removing the board. You can now repair your G5.