This is generally happens when the inverter is about to go out. The inverter is located in the bottom back half of the monitor and is basically a long light bulb. If you still have a warranty, this would be an excellent time to take advantage of it. If the warranty has expired, you have a few options. You can take it to a technician, who will probably send you to a tv repair shop and they will change the inverter. The inverter cost less than a dollar but the labor charges are what is outrageous. It takes a lot of work to take these monitors apart and put back together and more than one inverter will be broken during the process if the person is un-experienced.
I have dual AOC i2553ph monitors. One day I came into work and notice one of them had a single vertical white line moving slowly back and forth across the screen that looked like a scan or radar function. I reset the monitor from the OSD and all is well again. Use "Extra > reset" from the OSD on AOC monitors.
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