My iMac wont restart after my last update alumni keyboard

Please help, I am using my MacBook for this, my iMac will not restart after installing the last update, alumni keyboard....., after restarting, pushing the start button, all i see for hours, is the apple logo with the little circle spinning under the logo, please help, i already, disconnected, unplugged everything, used my original keyboard and mouse instead of my bluetooth, but nothing works, even ,power on while pushing option button etc. Anyone else know of this problem.Thanks in advance!

The long tone is an indication that a firmware update is installing. Do you get a progress bar at the bottom of you screen after letting the power button go?
Have you reset the PRAM? (cmdalt+PR when you restart the machine)
Also repair permissions when the machine is up and running.

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