Sudden white screen during use...

I've only had my new iMac for a few days and although it was bought used, it's been extremely well looked after, and things were great until just now when the screen went completely white rendering the mouse useless and forcing me to disconnect the power lead and start up again. Should I be alarmed or is there a simple explanation and a reliable cure to hand?

I have 24 inch iMac and I get either an almost black screen/white screen or sometimes a green and white vertical pinstriped screen. This happens suddenly with no warning & I have to hold the start button in to shut down. It then starts up fine with apparently no harm done. It is very annoying but I need to know why my Apple is doing this. Computer is around 2-3 years old and now running 10.6.8. I had to buy this as when I inherited the machine know one knew where the OS software was.
Does anyone rate Genius bar - can they determine what the prob is? I took a G5 tower in as it wouldn't start but they were unable to help - local PC shop sorted it charging me £100 - realised later it needed a new battery (£7) so you can't rely on anyone out there I'm afraid!
I will need a new iMac 27 inch anytime soon but am loath to give anyone currently selling machines the money!

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    Does anyone rate Genius bar - can they determine what the prob is? I took a G5 tower in as it wouldn't start but they were unable to help - local PC shop sorted it charging me £100 - realised later it needed a new battery (£7) so you can't rely on anyone out there I'm afraid!
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    [IMG]http://i49.tinypic.com/oisjft.jpg[/IMG]

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