I have a viewsonic VA912b that won't turn on for most of the time. when it doesn't, the green power light blinks. I have tried it on different pcs and same issue. I have also tried using a vga and dvi connection and no difference. any ideas?
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I will assume that you already try this monitor with other PC already, if that the case, you will need to open it up and inspect the capacitors in the power supply, look for caps with bulging top, see pictures here: http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VA912B/
Post back what you see inside so we can guide you further.
It's an issue with the power supply, most likely the Capacitors (one or more) may be shot. Open it up if it is out of warrenty, look at the capacitors (they look like cans), if they are bulging at the top or even sides they are bad. This is a common problem with this monitor. Crappy Caps used in manufacturing. Replace all the caps with same rated caps and you should be good. Do your research on how to desolder the old ones off and proper installation of the new ones.