Will not startup - goes straight to white screen

Hi guys,
I think I have killed my new iMac. When I press the startup button I get the familiar blue start up colour, but less than a second later it changes to a white screen with some dark grey blocks at the middle bottom of the display. I cannot start-up in safe mode, force bypass the primary volume or boot from disk. It won't even let me start in firewire mode.
The problem started when I tried using a shareware app off the internet, when I opened it it crashed immedietly with the white/grey screen that I am getting now. Could this be a virus? The keyboard appears to still work as I could eject the CD that was in.
Any help is much appreciated

Hi, Sorry to hear about your issues. Do you have an iMac (Flat Panel) (white hemispherical dome and display floating on chrome arm) or an Alu /White Intel iMac?
It's not a Virus as there aren't any for OS X yet.
cheers
mrtotes

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