After testing it, i found that at least with simple earbuds, you will just hear clicking when you plug the headphones in. There are no practical uses of plugging headphones (output) into a microphone port (input).
green headphone jack on the back of the computer
You wouldn't have your computer.
Technically, yes. However, a headphone jack does not provide a great deal of power, so you would probably need an amplifier for the sound output to actually be audible.
You can but you would need a sim card reader connected to your computer.
It is possible to connected a DirecTV receiver to both a computer and a conventional television. However, the receiver is designed to be connected to the television.
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A computer component would be part of the computer itself. Devices can be separate to a computer and just connected to it.
to elaborate on the question, I want to get a monitor that has a microphone jack and a headphone jack so that I don't need to use the single headphone jack on my laptop, I also want to use the headset with my PlayStation 4 and so I would like to know if I could get a computer monitor that I can plug a headset into like the Logitech G230 or G430 and still be able to use the microphone and ear phones
I have never tried it, so it is possible. It does provide electrical power. However it would depend on the LED.
It would be unable to do so if it was not connected to the internet
Absolutely nothing.
It will make a loud noise.