I have Nvidia GT710 card with 3 outputs, I had all 3 outputs working and could run 3 screens at the same time. However now only once screen works and the PC is not even picking up the other monitors. I have tried switching cables and the display switched to the other monitor. I have checked the card and it is seated correctly and still outputting to one monitor. It will only output through the VGA socket, the other 2 sockets give no signal whatever.