Screen behaves strangely and the computer would freeze on wake up

Hi everybody.
I have a problem.
Sometimes after the starting chime and the apple logo grey screen, my mac would show for a few moments a strange screen with little white "rectangles" filling the grey space. (see image).
Then, once that's what happened: I left my mbp in sleep mode but when I lifted the screen to activate it, the computer would not respond. The LED went off. After a few second I was prompted another very strange image.
It seems to me that a similar image appeared when, using Safari and opening or closing a new tab, the graphic card switches from one to the other (I have gfxCardStatus v. 2.0.1).
Does anybody have any hint or idea about what is happening?
BTW I am completely under warranty (It is less than 2 months old). Moreover I tried to perform the Apple Hardware Test (both "normal" test and "deep" test). Nothing wrong was found.
PS: I am writing here because it would be quite annoying for me to take my laptop to an Apple center and have it checked. I need it. That would be the real least resource for me.

I found the setting and made the recommended changes. I will check back in the morning to confirm that this is the correct fix. So I know going forward, in the event I put the commuter to sleep, what is the proper method to wake it for re-use?

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Screen behaves strangely and the computer would freeze on wake up

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