[ubuntu netbook remix] blank screen

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http://ubuntuforums.org – I am running jaunty remix on a Samsung nc10. For about two weeks now, I often get a completely blank, white screen. This frequently happens at start-up. The screen is blank but I hear the prompt for user name and password. I can enter them, and some time later, I will see the desktop. But then, occasionally the screen goes blank (white) again for about 30 seconds to a minute and then comes back. What is going on? Any ideas? All updates have been installed. (Hardware)