Why does my dual monitor setup not work?

So fluther friends, I was using my desktop and just got done finally getting the sound card drivers in, and then went online to browse the web. Then all of a sudden both my monitors went black. The power lights still orange, I began to wonder what had happened. I opened the pc, took the video card out cleaned the fins and reconnected everything, started her back up and the monitors stayed in their orange light state. I knew it wasn’t the monitors because they were well maintained. I am starting to wonder if it’s the video card. Or the new sound card driver that saved my day. I really need help because I went far too long without a desktop I don’t want to make it even longer. It also might be the PSU but it was practically brand new, and well under its max power. Help me please