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Yes, it does sound like a video card issue. The only way to test out this theory is to use another video card. Any cheapo video card would do fine in this test.
You already verify that it's not the monitor by switching to another monitor.
It is highly unlikely that it's the DVI cable.
By the way, keeping a computer running 24/7 is not good for it, even in sleep and hibernation modes. A regular desktop is designed to run 8 hours a day. Heat is what degrades electronic components over time.
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"If someone has to pass you on the right, you are in the wrong lane."
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