RE: UP3214Q - no picture after powering off the device / half picture at the login screen
What driver did you previously use? On my nVidia 870TI card I'm on 331.82.
It may be driver/OS related though - my old game box (don't have it to test with anymore now) ran fine with what I think were ATI 13.11 drivers on Win 8.1, then I set it up anew in order to sell, with Win7 and 13.12 and it behaved like it behaves on my other two PCs.
I've not tested the nVidia beta drivers though (331.92). I've gone through multiple iterations of the intel driver as well, but all were a nogo.