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It's not communicating with PC video card. It should pick up the input port, but make sure on monitor is set to correct input like VGA. You can try re-seating video card. Also test with VGA if you are using HD like HDMI.
I recently was given a MAG Model 780 too. I found the input for speakers just today. When looking at the monitor, on the left side behind the monitor you should be able to feel a flat horizontal surface. If you lay monitor down, you will see 2 mini-plug openings. These are your input spots for speakers/microphone. I believe pink is speakers & green is microphone.
The picture board on your monitor is bad, since it goes
off after few seconds and the power led or button is on, it means the
board of your monitor has developed fault.
The best thing for you
do now is to take the monitor to a local repairer or service center within your vicinity
to help with the replacement of the picture board
because the fault is not something you can fix yourself, in order not to