Sorry you are still having issues with this, Miss Bad Wolf.
I thought you would have it all working by now with all the great help that has been offered.
O.K., I am sitting here with my manual, and my VIZIO model (well, not mine. Family’s. Dirt poor, and couldn’t even afford a cold) is GV52L FHDTV 10A.
For us it boiled down to getting a new graphics card, and male/male (to female-graphics card/female-TV) VGA cable for the PC box to work. More importantly, though, was the fact we had to select a graphics card that allowed the VIZIO TV’s VGA timing to sync.
The sync timing is for the RGB PC input (VGA) needed to be set to VESA 1920X1080 at 60Hz on the TV, and the graphics card needed to have a 1920X1080 setting (60Hz) at Pixel Rate of 136.5 MHz.
This was important for the two to work together (sync). Otherwise, I would just get the same as you, TV says “no support”.
You need updated drivers (that support) for the graphics card, not your TV. This is the important part. If you have a graphics card whose drivers, or on board architecture does not support the syncing that VIZIO wants, then you will probably need to purchase a new one.
We bought a dirt cheap one at baseline support over at NewEgg_com. Getting the right one with the correct driver support will make all the difference.
If not, you’ll just have to stick with what settings the TV is allowing to be used right now (1280X720). At least you got it working.
But, please research exactly what is allowed before you make any unnecessary purchases. I would hate for you to buy a new card only to find out your TV model does not even support the higher HD VESA timing syncs.
Good luck, again…
Oh, and no, sorry, I don’t know of any screen savers that can work that way. I hope someone can come to your rescue for that one.