When you first turn on the monitor and then turn on the computer, the monitor screen flickers on and off every second or so, but it won't ever stay lit until you kind of whop it on the back, then it will come on and work just fine. You have to whop it right when it is flickering on. Other monitors work fine on this comp and cable. I can tell it is getting plenty of power and signal, the problem is definitely with the monitor itself.
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Try looking at the LCD screen at a sharp angle to see if ghost-like video can be seen during the 'off' time of the flicker.
If video is still present even though not that visible, then either the backlight or its power supply are failing.
The color problem could also be caused by a backlight lamp that is not ionizing completely.
i Have the same problem, this screen is used on the spare computer we have in a loft conversion and the room does get rather cold, Warming the screen up with a fan heater for a couple of minutes gets rid of the problem. When the fault occurs the buttons on the front to adjust the picture quality don't work they just turn off the monitor.