Hi All. May be you can help me to shed some light on my mysterious problem. Since a while my computer does not recognize my GTX 770 anymore on a regular basis during boot. After several restarts it is recognized as a GTX 660 both in the Device Manager and Nvidia control panel, but then runs stable, and it seems without any lack of performance. In the NVidia it also displays the correct graphics clock rate, etc. only it writes GTX 660 instead of GTX 770. When did that occur? Not 100% sure. Either when I installed a razor Nostromo or during some update by the Nvidia Experience software. Of course I am not sure if this is related in any way. What did I do so far. 1. Uninstalled the razor Nostromo. Uninstalled the display driver. Used driver Fusion (safe mode) Installed the driver 320.49 again. this time only the driver and PhysX did not help 2. Same procedure..unistall. driver fusion (safe mode) Installed the driver 327.23. Only the driver and PhysX did not help 3. updated graphics card bios did not help 4. Reinstalled win 8 Installed driver 327.23. Only the driver and PhysX did not help Also may be note worthy. In case the Nvidia card is not recognized but a generic VGA I see the whole boot sequenze coming up. Otherwise the screen stays black and I arrive at the Win 8 login screen directly. System spec. CPU: i7-2600K Motherboard: Gigabyte Z68P-DS3 v.1.0 (bios version not sure) HD: Samsung SSD 830 128 Gb Sound: Realtek onboard OS: Win8 Pro, 64-bit Anybody any idea? How could I get my computer starting up properly again and recognizing my GTX 770? I mean it used to work perfectly fine.