The monitor is either "locked up', or is not getting a signal from the computer. Unplug the monitor from power, wait a few seconds, then power it back up. If that does not work, press the reset button on your computer - your computer may be locked up in standby mode. If that doesn't work, connect the monitor to another computer to see if it will come on. If not, then you most likely have a failed monitor.[/quotemsg