I have an Acer G195HQL LCD monitor and recently I've been noticing a lot of disturbance on the screen. They appear to be like flickering horizontal white lines. These lines are more apparent on dark backgrounds like grey/black. The curious thing is that, the intensity of these lines increases and decreases with no specific pattern. The disturbance temporarily goes away when I detach and re-attach the VGA cable at the CPU end. My speakers are magnetically shielded, but the problem persists even when I turn them off. I don't know what to do and this is really annoying me. Is it possible that my monitor is failing? Or is there anything I should check?
Try another cable (and check for loose connection at the monitor's end), and try the monitor on another machine. If it shows the same problems there, the monitor is most likely defective.
The self test is a good way to check that. It can sometimes be difficult to see if the colors are warped, but it's a good test. Just unplug the monitor from everything, leaving the power cable plugged in and you should get the multicolor self test. Leave it up for a while to see if it does the same thing.
Trying another cable (Like Renan suggested) is an excellent idea, and it sounds like it could either be a cable or a video card issue rather than the monitor.
the problem is nor clearly defined here but i think i had the same with my 23" aoc led monitor (e2343Fs). on dark background, colorful or white areas start to extend with faint lines sometimes so long that a shadow of these areas start to form to the right. (lines extend to the right in my case, not either way)
trying every resolution, contrast and brightness options didn't work, so i bought a new vga cable, just to make sure the monitor is defected. and it worked!!! now i have the expected clear image on the monitor.
hope it helps...
First off I know I am responding to an old post but people are still finding answers here. If your PC or docking station has either a display port or HDMI outputs use these instead of VGA. VGA cabling is a very old standard and modern graphics push its limits. Display port and HDMI were created to overcome these limitations. The best advice I can offer is to use any cable other than VGA.