I have two asus 165hz screens. Last week my main screen defaulted to 60hz from 165. It reset fine. Yesterday the screen would not work at all error "out of range". I tried different cable and swappedscreens .. still same error. Booted into safe mode and still same error when trying to set above 60hz. Went to restart windows in normal mode and now nothing at all apart from screen menu and a no signal message. Is my gpu dead? I have a asus gtx 980ti matrix ... need pc urgently

thank you so much for that ... I've taken the gpu out and the onboard GPU fired up without any changes in bios. Booted straight into windows without a hitch. So, I've counted out the screen, counted out the cables, counted out any bad settings (using safe mode on both pc and GPU) .. are there any other tests I can try ? Perhaps I should pull out a gtx970 and make sure the mobo is ok ?? or is it irrelevant?