IMac 24" core 2 duo - sudden video + startup issue

Hi
I have a 24" intel core 2 duo 3.06 ghz from 2009 running snow leopard latest version
Last night the screen froze with a bizarre array of colours and video weirdness. I had to restart. Since then there is a weird black pattern over the whole screen and it won't get past the grey apple loading screen. I have tried starting from a. Cd - both a system disk and techtool pro disk - apple hardware test startup, safe mode startup all with no result.
It plays startup chime, shows the grey apple, has a litle disk spin think then freezes again. When I try and start from a cd the cd spins and I can hear it loading but in the end it gives up. I can't hear the hard drive spinning.
I have a genius bar appointment but first one available is sat am - any thoughts on what this could be. It seems like a hard disk AND a visor card issue but I can't understand why it won't boot from cd
Thanks in advance
Ben

Out f interest i reset the PRAM as well - it did nothing except change the weird video problem to a different pattern!
pic of screen - http://dl.dropbox.com/u/1531/imacscreen.JPG

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