Hello,
- The power supply on your station is 525W or 700W ?
- if you install another graphic card which consumes lessthan 165 W, it works or no
- if you test the gtx 980 on win 7 it works or no.
----- About driver------
could you please try to use the free tools "Display Driver Uninstaller" to remove all nvidia driver befor installin a new one
http://www.guru3d.com/files-get/display-driver-uninstaller-download,20.html
Best Regards