This application let you “blank” a screen of your choice when you have dual monitors in expanded mode.

For example:
If you play music through your tv from computer via HDMI cable you must have your tv on otherwise you wont get any sound.

Use this app to blackout one screen of your choice.

This program is only a black background so use it with care, especially in use with plasma since it will burn into monitor.

New version, get the monitor resolutions