u28e850r - No video, not even osd

I have a samsung u28e850r or ue850, and it gets no video, does not even display osd.

Initially the hdmi ports stopped working, but osd and display port ports worked, then the screen went black while i was using it.

It still powers on, and backlight works, usb hub still works, but no video, monitor is still recognized by the computer.

any help would be appreciated.