Netbook screen goes berzerk

I have a Toshiba NB205. Occassionally, whether using just a web browser or OpenOffice, the screen will start shifting rapidly on me (desktop image moving across the screen) and then I pretty much have to shut down. Not sure if it's a defect with the OS or the processor, or a virus or software conflict. However, it happened this morning when I was trying to install some antivirus software and was not using OpenOffice. It has happened about 4 times in the 2 months I have had this netbook. Has anyone else had this problem? What might be the causes?
Thanks, damikes.

I am not saying that this is your problem, just a maybe - worth looking at.
If you look at the bottom left of the screen bezel you will see that there is a small "peg" which pushes down the screen switch button when the screen is closed, this button may be stuck. It might be possible to lift the switch button up using some very fine tweezers and see if the screen then comes back on normally.
Andy  ______________________________________
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    Using a hot corner or keyboard shortcut will temporarily wake it up.
    If watching video, sound still plays even though screen is black.
    Had it in a 60 degree room with A/C blasting on it, no change.
    Tried resetting PRAM, SMU.
    Hardware test was fine, but I can't do this when it's not actually working.
    External monitor works fine.
    Really weird-  this does not happen with Windows XP.  It runs fine.  So maybe a software problem?  BUT, the problem occurs when booting from Install DVD.  So maybe not a software problem.  I was going to wipe and re-install but can't even do that due to it blacking out.
    I've had it in and they replaced the LCD, didn't help.
    I wish it would just permanently stop working so it'd be easier to figure out, as it is, the intermittent nature is driving me nuts.  Can anyone please help?

    I meant SMC, not "SMU".  Oops.
    billkline, thanks for the input, the fact that Windows works has really got me scratching my head.  That's when I went to reinstall OS X but couldn't when it blacked out on the Snow Leopard Install DVD.  Thoroughly confused now.
    Also, starting tonight it now hangs on the gray startup screen for thirty seconds before booting up.  This usually is a one or two seconds before getting the Apple logo. 

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