Just ran into this myself. If you happen to hold some buttons down on this monitor while it is powering up, or while you plug in the video cable, it'll go into some test mode (red-green-blue-white-black etc.) and won't display video.
How to cure it (upon some research and fiddling around):
- Unplug monitor and video source.
- Hold [2] and ^. (NOTE: apparently v and ^ work too but I had no luck with those.)
- Press power.
- Release [2] and ^.
- Plug in source.
- Unplug unit.
- Plug unit back in.
Should be back to normal after that.
How to cure it (upon some research and fiddling around):
- Unplug monitor and video source.
- Hold [2] and ^. (NOTE: apparently v and ^ work too but I had no luck with those.)
- Press power.
- Release [2] and ^.
- Plug in source.
- Unplug unit.
- Plug unit back in.
Should be back to normal after that.