NANAO T660I MONITOR

I was given a Nanao 20" monitor, the owner said that he had it in storage for a couple of years and was going to use it because one of his monitors stopped working. It was working fine when he put it away, but he unable to get it to fire up. So now I have it. I haven't had it on my bench yet, but I have done some online research and it seem that this monitor may work just fine. From what information that I can come up with the monitor needs a FIXED FREQUENCY video card. The big question is what is the difference between a regular video card and fixed frequency card and where can I find one.