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Weird screen on external monitor


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just got installed os 10.8.4. .. everything works fine but when I plug via D-sub external monitor the screen is glitching and "waving"


Notebook specs:

Lenovo Y570

Intel 2nd Gen Core i5 2 i5-2410M

Geforce GT555M 2gb  / Intel HD Graphics

6gb ram




Is there any solution for this problem ?


Many thanks!

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