SOURCE: MY ACER MONITOR , DOES
It maybe looking for a signal from a port other than the one you are plugged into.
Try to select a different input on the monitor .
check the PC to monitor cable connections at both ends.
if you have no luck there.
your video card might be cooked (broken) or the driver corrupt.
or on-board video chip driver might be corrupt (likely not cooked)
Let me know it this helped you or not.
Post your answers as a comment or reply and I'll be notified
SOURCE: I am using a MacBook
This is a very simple solution, fortunately. The default behavior of an external monitor connected to a portable Mac is to act as extra space, effectively extra screen "real estate," where you can move windows or do whatever else you need to.
Verify this by moving your mouse to the right-hand side of your screen, and then keep going - you'll see your mouse appear on the external monitor.
If you want to have the external monitor reflect exactly what you are doing on the primary monitor, simply go to Apple menu > system preferences > displays > arrangement and check 'mirror displays.'
And that's all there is to it!
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