External Monitor flickers with VGA adapter connected

Hey,

I just bought a Mini-DVI to VGA Adapter (a cheap one). I tried to connect my PC Monitor to it, but I just get a blue screen on the monitor, sometimes I get a Windows on it but when I reach the left corner on the external (or the right cornor on the internal) monitor everything on the external monitor begins to flicker and I cannot see my mouse anywhere. I also cannot use one of the monitor, I need to flicker around with my mouse to get it working again... Anybody knows if its because of the cheap adapter or the graphics card? When I close the MacBook I can use the external monitor how I want it (as a normal monitor). when it is opened I think OS X tries to use the external monitor as dual screen but as I described above this fails....

THanks for any Help

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