Starting from the monitor and going to the video connection to your computer, make sure everything is connected and undamaged. If your video card has more than one output, try switching the cable to the other output. If neither is working, and the monitor works fine from a different computer, then its the video card, otherwise its the monitor. But again, before dropping any money on a new monitor, try a different cable, and try switching the cable to the second output if there is one. A video card is definitely cheaper than a monitor.
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