make a monitor go to "sleep" (but only one)

[gameover]

hi,
My secondary monitor doesn't get much usage, but i don't want to turn it off by its button as i use it for a usb hub. Is there any software that can make one monitor go to sleep (a bit like when you don't touch mouse/keyboard for a while, it switches monitors off until you move mouse etc)?

 

[gameover]

bit of pain to do that, would prefer a one click thing or something. just seeing if someone like it exists

thanks

 

[gameover]

i've obviously tried that! the usb hub turns off if i turn the actual on/off switch off.