Acer VG270 - OSD Menu Settings; Input and Picture Settings

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(3)Do “Auto Color” in factory mode.
5.2. Do factory reset in user menu.
(1)Restart the monitor after open factory menu. And then open the user menu.
(2)Factory reset will turn off “Burn in” mode which screen color switches among red, green, blue and black.
Check this
F/W version.