I can't connect my TV (CRT) with my PC via S-Video.

When I press "Dupicate" or "Extend" options, a popup message appears and says "Duplication of displays over multiple graphics proccessors is not supported" or "This operation is not supported based on current display configuration".

What can I do?

My PC specs:

cpu:  i7 Core

vga: ATI Radeon HD 4800 Series

OS: Win 7 x64

S-video only supports 1024 x 768 max, you would have to set your res to that or lower before using clone / duplicate.

No my problem is I can't have monitor and my TV connected in the same time.

When I press the option "Replace", monitor is disabled and TV works fine.

When I press the two other options (Extend or Duplicate) the error messages showing up.

Then you haven't got your monitor plugged into the correct port then as one Ramdac is shared between s-video and DVI and cannot be used at the same time.

I found why I can't connect monitor and TV (CRT) with my HD 4800 at the same time.

The monitor I use haven't DVI port when I've change it with a new one with DVI port, everything works fine.

Graphic Card can't handle two output sources connected via VGA, one of them must be connected via DVI.

My problem SOLVED!!!