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Graphical Freeze

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Last response: in Laptops & Notebooks
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Okay, so, here's my setup. I have a Sony VAIO VGN-FW140D with an ATI Mobility Radeon 3400. I have 3 external hard drives(which probably have no bearing on the problem). I have Windows Vista, and I have a second monitor, an NEC MultiSync1940WCXM.

My problem had two stages. At first, both monitors would occasionally freeze, and then resume with the infamous error message "atikmdag has stopped responding". I just sort of worked around that for a while, and then it changed into a problem that I have no comprehension of.

What happens is that the screens will freeze, except my cursor. My cursor can still move around the screen, and manipulate things. Everything is still running, but the monitors are frozen...Except the cursor. I have no idea what the heck is wrong. This problem only occurs when I have my dual display going.

Any thoughts? I've tried updating my drivers and all that fun stuff.

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