I've just had a second VP213 LCD monitor go bad the same way ... for several days it flashed between pictures and black on resume from screensaver or monitor sleep. This morning, it tried to get to a picture and only ever displayed a blank screen. The computer clearly thinks it works, since it continues to use it as a primary device, but I can't see anything. The power light is black as well, though it will turn amber if the computer is undocked. Help!
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Assuming both the power cable and signal cables have been checked, have you used the on screen controls to select appropriate signal feed source ?
Yes, it's not that. The monitor (both of them) had been working for years in that configuration. It's as if the signal's getting there, but simply not being displayed.