When my monitor says "In power saver mode, activate using PC", how the heck do i wake it up?

I have this glitch, only on pokerstars, i click on anything, cashier, etc. and bang off goes the monitor. I have only been able to get it back by restarting the computer m- then I have to wait at least 5 minutes to get back running online.

There has to be a way to wake it, but no key on the keyboard does anything!