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10-12-2021 03:56 PM
With the computer powered-off, and the power-cord removed, open the computer case, and check that the add-in video-card is securely "seated" in its socket.
Similarly, check that the sticks of RAM are securely "seated".
Look for any loose, or not connected to anything, wires.
Or, take the computer to a qualified computer technician.
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