Display toggle on/off Sleep mode seems to cause problems with my MacPro.  Is there a way to turn the monitor off and on?  In "System preferences/Display/options" I can select "Display Power Button" "turns the display on and off" but that does not work.  If there is a key board toggle, that might help.
You can set up a hot corner to turn the display off without going to sleep. Go to System Preferences &rarr; Mission Control &rarr; Hot Corners and set one of the corners to Put Display To Sleep. Wake the display by pressing any key.