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When the LCD monitor shows you "no signal" it only means it cannot acquire any feed from your computer. If you made sure all cables are connected properly and tightly, then there must be something wrong with your video card on the computer or the VGA cable itself. To verify is this is a problem with the videocard, then try another monitor, if you have a spare, and see if you can get picture; if yes, then you have a problem with your AOC's VGA cable. Try to twist the cable on both ends as if you are adjusting the wires inside.
Might be a loose connection, a bad cable, or a bad video card. I'd try the monitor on a different computer--even a laptop. Should give you an answer as to what's wrong. With the laptop, reboot it with the video cable attached.
Use best quality data cable directly from VGA card to LCD input and your problem will be fixed.
Usually that problem oocured when we use external tv device with CPU and monitor so signals gets weak and auto adjustment popups.
I had the same problem with my HP LCD. I'll turn on the monitor and it will run auto adjust and set everything to the max making the screen very bright. What I did was remove the button panel board and put it back. Everything works fine since then.
Hi, it might be that a sensor in the monitor is sensing change in ambient light and therefore reacts by auto adjusting the contrast. when you push auto, it will do just that and auto react. Why not try manual and set it to your desired setting and let it run that way.
But then again, of course it is possible that something is really wrong with the monitor and you would need a qualified service personnel to diagnose/repair it.
Hope this be of some help and pls post again how things turn up. Kind regards.