Windows on second monitor always go back to main iMac screen when screensaver comes on

[chublet]

I have a 21" iMac running the latest OS. I have a second screen connected via a Thunderbolt-VGA adapter - I use the iMac screen for general use and the second monitor for showing a feed from my CCTV cameras.

All works great except for the fact when the screen goes to sleep on my iMac and the second monitor, when I move the mouse both start up again immediately but my CCTV feed is on the main screen, I have to manually move it across to the second one. This happens with all windows that are open on my second screen so I know it is not the CCTV software.

This is driving me mad - any idea how to fix?

 

[chabig]

I don’t know but I suspect it’s because you have the second monitor connected via VGA, which is an old analog connection. Does that display have any digital inputs you can try—maybe HDMI or DVI?

 

[chublet]

Thanks for the reply - it has dvi but it doesn't have HDMI, unfortunately I don't currently have a dvi lead or adapter, but I do have a HDMI tv I will try with - thanks for the advice!