Monitor screen turns off, and has o be turned off

Check for back lighting. The screen will glow.
Sound like the power board is out.

Change the power plu fuse for the second monitor.
Disconnect the data lead from the monitor and reconnect it

The monitor has failed, it is almost always cheaper to replace it than fix it.

no data is getting to the monitor , check cable

This is a problem with the power supply unit inside the monitor, there is no easy way out here. If you keep on using your monitor like this eventually it won't switch on no matter how long you wait. Keep on using it like this for the time being without switching off anything but ultimately you will have to take it in for repairs or otherwise purchase a new screen..

make sure that all the cables are connected FULLY.
blinking light means that there is no signal.

The monitor requires service The monitor is not receiving a signal from the computer

i had the same problem now my monitor wont even turn on if i do that the power light just keeps blinking maybe its a sign of a dying monitor

Base on the information given to me.

I think your computer is on sleeping mode.

first thing check if the video cable is not loose connecting the pc.

because what would happend, if it is loos it would turn on and off at times.

The other thing you can do.

right click on the desktop.
go to properties
go to screen saver
click on power

adjust the time you want your monitor to shut off.

Assuming you've already checked your driver and system settings, tried a different monitor, and checked the cable and connector pins, this would almost certainly be a problem with the power or signal circuit board inside the monitor.