What to do when a DVD is stuck in the drive on an old iMac, and it refuses to booth up? There are numerous ways of doing this, including: Start up while holding down the mouse button. Start up while holding down the Option key, then hit the eject button. Start up while holding down Command-Option-O-F, to enter the Open Firmware prompt, then type “eject cd”. Start up while holding down Command-S to enter recovery mode.