Hi, i have a 7520 Acer, and my friend has other model of acer laptop, the 2 came with vista preinstall, and at first there was no problem, but sudendly they wont connect to the lcd projectors, it eather shows no signal or it flikers, we tried changing the fliker rate, the resolution and number of color but nothing seems to work and it seams like its a general problem with acer laptops, that the external monitor fails, does any one knows what to do???
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