Check all the connections, the cables between the CPU and the monitor and all the electrical cables. Check the wall socket or surge strip to see if they are bad (sometimes a surge strip will have good and bad outlets). If you have a green light on your monitor but not on your CPU, then there is a problem with your CPU. If there is a green light on your CPU and not your monitor, then you have a problem with your monitor and your CPU may be fine. If you have another monitor that you know is good, the quickest way to test is to put another monitor on the machine and see if you get an image on the screen. If you have a light on both the monitor and the CPU, check the pins of the data cable between the monitor and the CPU. A single bent pin can cause an image problem.
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