Disc won't unmount during a reinstall of os....help

I am having the same problem with my imac. I tried to reinstall everything, however at the end of this lengthy process, it fails and now the disc will not come out. I have tried to use the disc utility to eject the disc but it will not allow me to do so as the system is still trying to run the installation. How do you get the disc out of the drive????

How do you get the disc out of the drive????
Try restarting the computer with the eject key depressed.
Roger

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