Shut down the computer and start up whilst holding down the mouse button. This may take some time, but keep your finger on the mouse button right up until the disc comes out or the log-in screen has appeared.

Any advice for a stuck CD/DVD that won't eject. Error says can't unmount.

shhhhh, it's called ie bAe eYe

via Everymac.com

Standard RAM: 1 GB Maximum RAM: 4 GB*

Details: 1 GB of RAM is installed as two 512 MB SO-DIMM modules.

*Apple officially supports 3 GB of RAM, but third-parties have been able to upgrade the system to 4 GB of RAM using two 2 GB memory modules