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Undetected Grapic Card

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Hello everyone.
So, here is the problem. I was playing some videogames and then my AC was getting conected and disconected making my Graphic Cards switch between the 2 of them, then I got like 3 blue screens in a row and so I rebooted and my resolution went from the highest (I cant remember what was it) to 1204 x 780. Then, i checked from DXDIAG and it appeared as if there was no graphic card available, my laptop has a graphic card switch key but it won't switch anything...
Here are some specs
Alienware m17xR3
Windows 7 home premium 64 bits
8192 MB RAM
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Try a system restore to the restore date immediately before this started and hope for the best. Otherwise, delete the video card drivers and reinstall.
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