When I close my laptop lid and it goes to sleep so that I can use an external monitor, monitor does not turn on when I hit a key to start laptop

When I use my external monitor, I cannot get it to work after awakening my laptop using any key.  My monitor won't light up although laptop keyboard is backlit showing that it has come out of sleep mode.  Why does the monitor not get the signal from the laptop?

I still cannot figure out why it doesn't always work.  All parameters were met and my bluetooth keyboard is set correctly to wake the computer.  My keyboard becomes backlit, but my LG monitor does not pick up a video signal and is black and my laptop monitor is off.  The only way I can get out is to hold on button on laptop until it shuts down and I can start up again.  This happens on an intermittent basis.  Sometimes it works and other times I get black screens.   I need to know if I can use command F1 to get the laptop to detect the display or is their another key combination to send the signal to the external monitor when I can't see anything because I hate to do a hard shut down to get out of this mode!  Please advise!

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