I've just upgraded my GT 630 to an HD 7750. I deleted everything that had to do with my GT 630 including display drivers, physx, etc. I also used Driver Sweeper so I doubt the installation of the new GPU is the problem. I downloaded AMD Catalyst 14.4 for my card and when I try to open a obj. file in Photoshop, it gives me an error that the openGL is disabled. I go to Help > System info and find out that PS is not detecting my video card; "No video card detected".
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