monitor shows waves

Hello there,

Make sure you don't have any power source or another monitor or any speaker power next to your monitor. If your monitor is not close to any other power device then check that your video cable is properly attached to your video card.If still the same, use a friend's monitor just to test and if still doesn't work then you got a video card problem.

Good luck,
@lberto

When you check for nearby power sources, check for major power lines near the PC.
Had an installation once where there was a large power conduit 10 feet above the PC. It still caused strong enough fields to put waves on some monitors.

If this just started, it is possible that the monitor is starting to fail. But, even so, it could be years before it actually dies.

Play around with the monitor refresh frequency if not try another monitor.

The first two answers ar correct. Your problem comes from electrical interference from another source. Just don't overlook anything. I have seen: another monitor, a fan, an electric heater, a power line in the wall behind the monitor(that was a bad one),a cable modem, a power strip, and a small radio. Don't overlook anything. Lift your monitor straight up and see what happens. move it to the front of your desk or to a chair , if you can. Or just move everything away from your monitor. Hope thathelps.

Take inventory on what equipment is plugged into the power circuit your computer is connected to. If there is too much equpment on the line, or some other equipment is causing power fluctuations, or the power is not stable you should probably put your computer on a UPS to filter the power.

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