Portege R600 - screen occasionally flashes

This R600 is only two weeks old.
XP, no modifications (original HDD), no strange software, and malware analysis doesn't find anything.
Once in a while (15-30 minutes apart) the screen will "flash". It goes dark for a fraction of a second and then is normal. It's not getting worse or better.
I hate to send in this unit... any ideas?
Thanks

I think this could be a problem of the LCD or FL inverter but I would try first an external monitor if the same error happens on it so check this!
Furthermore in your case I would try to update the display driver and the BIOS. Both you can find on the Toshiba website:
http://eu.computers.toshiba-europe.com
Good luck!

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