It sounds like a faulty motherboard.
When you tried the other monitors, did you use the same cable - or did you try different ones? A faulty cable is often the culprit in cases like this. Have you tried using your monitor on another computer?
Best Black Friday Deals 2017
How modern book design was influenced by illustrated manuscripts
Best Black Friday Apple Deals 2017
Les meilleurs logiciels de montage vidéo gratuits (en 2017)