horizontal lines moving up monitor

May 2, 2013 at 08:19:04
Specs: windows 7, intel i3
my video card has 3 outputs

dvi dual
dvi single

dual has a vga converter and is in monitor 1
hdmi is straight into monitor 2

just today i got a single dvi -> hdmi cable to plug into my tv. now i have faint (almost watermark like) lines constantly scrolling up my monitor. when i unplug the tv's cable they go away. as well they persist through no signal coming to monitor (example: when i change display settings and the screen goes dark for a second)

any suggestions?

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May 2, 2013 at 16:25:10

Look at the posts by Bystander.

How do you know when a politician is lying? His mouth is moving.

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May 2, 2013 at 16:35:16
Sounds like some sort of earth loop resulting in a reaction between the supply frequency and the monitor frame rate. I have no cure but wonder if a very small shift in the monitor refresh rate (either way) might help in some way. If you care to try it don't stray too far away from the native value (usually 60 for LCD).

The procedure is given here:

Always pop back and let us know the outcome - thanks

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May 2, 2013 at 20:26:52
Sounds like what we used to call "hum bars" in the old days. Usually it was due to a failing capacitor in the power supply but could also be caused by a ground loop as Derek described. You could try putting ground lift adaptors on your equipment. You can find them at any hardware or electronic store. they are the adapters that convert three prong plugs to two prong.

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