P2214H, Ubuntu, VGA, DVI-D, not working

Hi, 

I have this P2214H monitor and it only has VGA and DVI-D input ports. So, suddenly both ports are not working. Whenever I am trying to connect it with CPU (Intel i3, Ubuntu 16.04) it shows no input cable detected. I have already checked the cables and CPU, which are working fine with other monitors. What to do?