After some Googling it seems that the problem is related to graphic card drivers. You have had a Quadro card installed and a GTX card. Did you uninstall the Quadro drivers before you installed the GTX drivers?
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After some Googling it seems that the problem is related to graphic card drivers. You have had a Quadro card installed and a GTX card. Did you uninstall the Quadro drivers before you installed the GTX drivers?