IMac screen pixelated won't restart, force restart still same thing?

IMac screen pixelated won't restart, force restart still same thing?  I was using the latest Firefox and Mail was open on another desktop. Any ides?

http://support.apple.com/kb/HT3964
http://support.apple.com/kb/HT1379
Try these methods while disconnecting all third party peripherals from the system. So ensure that the second display is disconnected from the iMac as well during these procedures and attempt starting the system with nothing but the Keyboard/Mouse plugged in.
We're going to essentially attempt to reset all the electronics and firmware on board the system to see if we can't get it to restart, let me know if this works for you Neil.

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