Monitor suddenly goes dark

My monitor has recently started suddenly going dark.  I get a little blue box that says "No signal, analog" and then the computer keeps running but the monitor won't come back on till I shut down and disconnect the power cord 2 or 3 times. This happens in Safari, Firefox, and Logic.  It may happen in other apps but those are the ones I use most frequently.
My computer is a 2007 Mac Pro dual core intel xeon.  The graphics card is an ATI Radeon X1900 XT.  The display is a VX2255.
Tanks,
Jon

I get a little blue box that says "No signal, analog"
That message comes directly from your display, not from the Mac.
Consider replacing your aging graphics card with an Apple-firmware 5770, about US$250. It works in every model Mac Pro and drivers are in 10.6.5 and later.

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