top of screen is black wavy lines that move up and down

January 27, 2015 at 16:59:17
Specs: Windows XP
top of screen is black horizontal wavy lines that move up and down. It covers the whole bar at the top- cant see anything through the black with those wavy white lines going up and down. It is just at the top of my monitor screen, the top 3-4 inches of it. It comes on after the computer is on for about two hours and never goes away. How do I get Rid of it ? Is it the computer or the monitor with the fault ?

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January 27, 2015 at 17:14:22
This is an external monitor? If so, can you test the monitor on another computer for a similar length of time; or borrow another monitor and see if that produces a similar effect after a similar period of time?

It "may" be a hum bar of sorts - usually caused by a fault in the power supply for the monitor itself. Less likely is it being generated withinthe computer itself (the graphic card); but not impossible...

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January 28, 2015 at 13:17:40
Thank you for your reply. Yes it is a regular outside stand alone monitor - the old fashioned kind - the big ones. . It began happening about 3 weeks ago. The computer is a "new" refurbished one. It's working fine. The Monitor is about 8 years old. So far I've had it on 2 hours now so it should be happening soon. If I totally re-boot it stops but If I have a newsletter in the process I can't just close it down and reboot. Thank you again for your reply.

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January 28, 2015 at 13:55:08
Borrow another external monitor to confirm the fault is within the monitor (or not).

The symptom you describe is pointing to/suggestive of problem with monitor power supply; or a smoothing or decoupling condenser(capacitor) on the main voltage rail.

If you connect your monitor to another computer and wait the hour or two... that also may confirm the problem is within the monitor( or not).

Another test.

When the fault appears, do not reboot the computer. Simply power down the monitor (remove mains power completely), and let the monitor cool down as it were. Then after a while power up the monitor again and see if the fault is still there (or not). If it isn't it points again to the problem being within the monitor. Leave the computer (booted up/logged in) on the whole time whilst the monitor is cooling down,,

Whether or not it's worth repairing, depends on the fault and how much it may cost?

message edited by trvlr

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January 28, 2015 at 16:04:58
Okay I'll try that. Thanks

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February 3, 2015 at 17:23:40
Found the solution that works for me. When it happens, I just run off the monitor (not the computer just the monitor) and keep it off for a full minute and then turn it back on and the wavy lines are gone.

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February 3, 2015 at 23:58:35
At least you know it's the monitor that is faulty. That the condition "disappears" if the monitor is "power cycled" over a minuteor so does tend to suggest an electrolytic condenser/capacitor as a possoble cause; likely a smoothing condenser/capacitor in the power supply cct., or a decoupling condenser/capacitor on the main voltage rail(s). Finding it would require workshop technician with a little experience at least.

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