PC monitor

Hey guys I have a lg 22" LCD flatscreen monitor and recently it stopped working like I'll turn on the computer then the monitor and the monitor well say analog power saving mode and turn black so I can't do anything on my computer does anyone know how to fix this?
 
On the chance that it is bad cable try changing it. Does either the graphics card or the monitor have other outputs/inputs? If so, try switching to them. If nothing helps, it could be a bad graphics card, power supply or something else.
 
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