Stuck at boot screen after installing updates.

I was prompted to install updates. Got a message stating that the updates couldn't be installed and that the system will be restarted. When booting it gets stuck at the apple screen with a spinning wheel. A progressbar appears for a while and ticks to about 5% and then disappears. If I leave it there nothing happens for hours except the computer getting very hot.
I've tried to use keyboard commands to boot in either safe mode or from a CD but I can't get them to work.
Using an Imac with a BT keyboard.
Thankful for any suggestions.

Jort Blanken wrote:
I connected usb keyboard and mouse (not mac) and tried a lot of combinations (I dont have an options key).
the equivalent to the options key on a winsloth keyboard would be alt.
to eject the DVD, restart the computer and after the chime press and hold down the left mouse button until the disc ejects.
see if that gets you a step further, then post back.
JGG

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