Asus Monitor

I am have an issue with my monitor,when the monitor is on I will expierence the monitor going black,I can be using the monitor and it will go to a black screen if left alone for any time.Can anyone shed any light on this
Have performed troubleshooting such as changing the power settings,I have the machine in an open area so their is no dustbunnies build up.
I can move the mouse and it will wake up