Strange freezing/display problem

Hi,
I've recently started having some strange problems with my 24" iMac 2.16GHz.
What happens is the screen freezes, not just the application I'm working in, but the entire screen. If I move the mouse it looks like the screen tries to redraw itself so I might get a browser window half-duplicated and then other windows look like they leave a trail if you try to move them. I can't click on anything, I can move the mouse for about 10 seconds, then I get the coloured beachball and I have to restart from the back.
A couple of times when I've restarted there has been a high pitched tone before the start-up chime.
I can't say exactly what I was doing when the crashes happened but a couple of times I've been looking at videos on YouTube. It may be related, I'm not 100% sure though.
I can't really explain it any better than that, sorry it's not as clear as it might be. I can't take a screenshot or anything when it happens.
I've run Disk Utility from the OS CD to repair the disk and it didn't find any problems. I haven't installed any new hardware or anything like that.
If anyone had any idea what I might try to find out what's going on I'd really appreciate it.
Thanks.

Sorry to bump this but this issue is still ongoing with me.
I'm nearly positive it is caused by watching videos on YouTube, Googlevideo etc. It just happened again while on YouTube. Screenshot - http://img220.imageshack.us/img220/342/screeniu8.jpg
After about 20 seconds I can click around and the screen goes back to normal when I move the windows. It's almost like using the eraser tool in Photoshop or something, you can 'wipe out' the bits that are not where they're supposed to be.
Yesterday I reinstalled the OS, I did an erase and install as well. Does this mean my graphics card is the problem?
Any advice on this would be a great help because I've got a huge amount of work at the moment and this is proving really disruptive (and before you say it I was taking a break when watching that YouTube thing!).
thanks

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    Owner & Operator of the following:
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    ★ Find a post helpful? Thank that member by clicking on the ☆Star☆ to the left awarding them a Kudo.
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    ★ I'm not a Lenovo employee, just a volunteer geek who likes to help folks. Enjoy your time here, pay it forward by helping others !
    ★ Sorry, I don't answer questions via Private Messages. Posting in the appropriate forum is the best way to get assistance.

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