IMac Monitor not working properly

My iMac 24 monitor has started acting strangely. I hve what looks like snow or flickering across the whole screen. I tried rebooting and at the Applw startup screen the scrrne is covered with noise and the Apple lgo is semi duplicated higher on the screen. It seems to bootup and then the screen realy goes crasies with black blocks in 4 columns on the right side of the screen.
looks like a monitor problem. I tried unplugging everyting and startw ith shift key. no luck, same thing.
Any suggestions other than take to Apple. It is a 2008 unit so it is outside of warranty....
I think I have uptodate backups of most of info using time machine. I may be missing a bit from Parallels, but should be enough to get back.
I currently have it unplugged to see if cooling it down helps. I am guessing graphics card is ...
It was not overheated when this occurred, I had just started it from sleep mode...

You're likely correct in that it could be a failed/failing graphics card but you could try a couple of things that might help, if you haven't already. Sounds like you have backup organised - you may need it.
Are you really running 10.8.2, as per your profile - 10.8.4 is the current version? Applying the combo will bring you up-to-date with the OS: http://support.apple.com/kb/DL1659
Try a Safe Boot: http://support.apple.com/kb/HT1564 - once booted restart as normal from the Apple menu.
Boot into the Recovery HD and run Disk Utility to see if any repairs are required. Restart holding down Command = r - more info here: http://support.apple.com/kb/HT4718

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This is from the Service Source:
"Screen is dark, fan is running and the hard drive is spinning. You may hear the startup
chime as well.
1. Reset parameter RAM. Press Command-Option-P-R during startup before “Welcome to Macintosh”
appears.
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IMac Monitor not working properly

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