MacBook Pro :: Flickering Screen And Loud Alarming Sound

Apr 16, 2012

Hey, 

I have a late 2011 MacbBook Pro with Lion. Sometimes my Mac gets vertical flickering bands almong with a really loud alam/emergency sound. Since I am in an office with svereral people, I have to swith it off by using the power button. I upgraded my RAM to 8GB (did it my self)... but there dosen't seem to be a problem with it since it says OK in the System report. Can someone please tell me what the problem might be? 

Sincerely, 

Johannes

Info:
MacBook
Pro, Mac OS X (10.7.3)

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and

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