DVD won't eject

[verithingeoff]

Imac running El Cap. DVD I have used many times, I loaded it and get a message "Supported disc not available". Can't eject via the player or the eject key. Tried turning off several times. Each time I tried a variation of the mouse wheel and eject button.Also tried logging off and back on. Non of these work and the disk doesn't show in finder. Any bright ideas guys?

Geoff

 

[lclev]

Try rebooting and hold down the mouse button (or trackpad button) while the computer reboots. This is supposed to force an eject. I also had a friend who also laid the iMac on it's side - DVD slot down and did the reboot + mouse button hold and the DVD came out enough to grab it.