I have a Dell demension 4600 series that I got 4 years ago. The monitor has started flickering. I need to find out if the flickering is caused by the monitor or the video card.

Try connecting the monitor to the on board graphics. If the problem still exists then the monitor is faulty.
You will probably have to disable the video card in the Hardware Manager or physically remove it from the slot on the motherboard.
You may also have to enable the onboard
video.
Do this before changing monitor connection.

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