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There is no communication to the video card. Try checking cable. Reconnect. Make sure monitor is set to correct input, like VGA, DVI, or HDMI. Reseat the video card, and if still nothing, test with another video card.
Is the monitor showing a blank screen or is it showing the message NO SIGNAL??
If you have a Desktop try the steps below: If it is showing the message NO SIGNAL, then the video card in the computer is bad, because when the monitor is bad, it will show nothing at all. To isolate the problem plug another monitor on the computer and see if it displays. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays ok, then your original Monitor is bad. If the Borrowed monitor displays the same as your original, then the video card in the computer is bad.
This may sound ridiculous, but I recently spent two weeks troubleshooting a monitor that wouldn't display properly. Turns out it wasn't plugged in all the way. Make sure that it is plugged in properly, and that your computer/device is displaying TO that monitor.
If it says no signal input, then your computer is not putting out a signal. Possibly a bad video card. Also can be a computer that never really boots up and passes the POST. Unless the POST completes, it won't send a video signal.
you need to go to display properties and make sure that the 2nd monitor is set to on.
do this buy right clicking on the desktop and choose display properties
go to advance tab and you should see two monitors, click on it and you should see a option to turn it on.
Sounds like your video card has gone out- if you are receiving no video, check if there are a series of four LEDs on the back of your tower- they should have a code. If you see something other than all four lit, chances are that the video card has completely failed and would need to be replaced.
Kindly try to disconnect the monitor from the computer and check it by connecting to power source only to see if it runs the self test, If it shows you the No input signal on the screen that means the monitor is working fine.
Please forward more details for further trouble shooting