Same issue but...
Instead of having to reboot or uninstall drivers, a quick fix is simply take a mini-DVI adaptor and plug it into the dvi mini port. Voila - -your screen will work - -regardless of whether or not the DVI is connected to an external screen.
I simply plug mine in for a second and pull it out and my screen comes back to normal (no more blue or colored snow).
A work around until a new beta version is available
D.
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