When I start up my computer and try to use my Oculus Rift CV1, the headset has sound but the screen remains blank (yellow light).
I have R9 290 graphics card connected to 2 monitors & Oculus Rift. The rest is win10, i5 4690k, etc..
I tried disconnecting the hdmi rift cable, usb3 cable, add extension etc. Nothing seemed to work but by chance, in my previous trial, adding the HDMI extension seemed to work. But that is not the reason for the fix, so it failed yet again the next time I started my computer and tried on Oculus Rift.
Oculus Runtime has a problem with multi monitor setups. It does not want to recognize the Rift CV1 headset if the second monitor is enabled (Extend your desktop). So, the temporary fix is to enable desktop only on Screen 1, then restart your PC.
On restart, you will find your Rift CV1 usable (white light on headset) again.