Display switches to green and black colors

New RFB 2.4gig MacBook Pro display switches to green and black colors and looks like a 256 color mode. It has done this two days in a row and only after surfing for about 1 hour. Restart fixes the problem. Usually when this occurs I have Safari, Opera, Mail and maybe another program open and occurs when closing windows in rapid succession. Situation does not occur for the remainder of the day.

The problem has not occurred for two days after extensive use of the laptop. Both times that I got the green and black screens was after using the 5.8GHz telephone handset near the laptop. I updated to the latest Flash Player but I doubt Flash was the cause of the problem since Flash is regularly used and the condition only repeats when the telephone handset is used near the laptop. Never have had a problem like this with 6 previous Mac laptops.

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