This has happened to me twice before but I knew exactly what caused it. I was mucking about with the video resolution settings the first time. The second time I was installing/re-installing the video card numerous times. I believe I didn't get it reseated properly.
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Test machine:
Vista Home Premium / Toshiba Satelitte X205 / 2.0GHz Core2 Duo / 2GB memory / 2x NVIDIA GeForce 8600M GT
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