So I've used a tv as a second monitor before, that being my 26" Vizio, through an HDMI to HDMI to DVI adapter. Got it to work no problem.
I now have a 24" Orion TV that actually has a VGA port, but unfortunately I don't have a second VGA cable ATM. I would use an HDMI cable, but my tower doesn't have an HDMI port.

That and my HDMI to DVI adapter broke SO I simply decided to use my new Orion TV as my main display.
I put it on the "PC" input and simply switched the VGA cable from my old monitor to the TV, but I get a "not supported" signal when I plug it in. When I take it out, it goes back to "no signal". Not understanding why this is happening considering all the manual stated I needed to do was plug the VGA cable in and switch over to the "PC" input.
Any help is much appreciated.