Seriously weird stuff with MacBook Pro

[RHD]

Today when I woke up MacBook pro the screen went into some weird black and white snowy pattern like a badly tuned TV on an old test card and froze.
Now weird stuff is intermittently happening with Preview, see attachments.
It's colourful but what TF???

[anirban]

It seems as if the contrast settings are changed around.

Try pressing Command-Option-Control-8, and see if it makes a difference. It essentially inverts the color.

I dont think its a hardware issue, as it is occurring only on windows, and is not fixated at one part of the screen- correct?

[RHD]

So far it only happens on Preview (the Apple program) windows and not all the time.

[Scarlet Fever]

That is really weird. Before calling it a hardware issue, I'd do the regular troubleshooting stuff; repairing permissions (http://guides.macrumors.com/Repairing_Permissions) and zapping the PRAM (http://guides.macrumors.com/PRAM). If it's still happening, a file system check (http://forums.macrumors.com/showpost.php?p=5432030&postcount=3) might be needed. If that still doesn't fix it, try re-installing the OS.

If none of the above fix it, take to an Apple store to have a look at.

Hope that helped :)