Display blinks on and off

I'm using two displays with my G5. The primary display recently started blinking on and off when I used any "busy" web site, meaning a site on which images constantly change or text automatically updates. The problem occurs in both Firefox and Safari, although it seems to occur more frequently when I use Firefox.
There's no issue with the secondary display. If I move the browser window to that display, I can browse all sites without problems, regardless of the browser I use. Also, when I quit the browser on the primary display, the blinking stops; it doesn't occur when I use other applications.
A self-test of the primary display checked out OK, and the problem persists even though I replaced the monitor's cable. Coincidentally -- or not -- the problem occurred after I installed Leopard on the Mac.
Any ideas about what's happening or what I can do to diagnose?
Thanks.
David

Thanks for the response.
The problem (which I just noticed occurred in Entourage also) resolved after I reversed the monitor connections. I then reversed the connections back to the original configuration, and the problem has not recurred (at least so far), either in the dual-display or single-display configurations.
The only thing I can think of that may have had an effect is that the primary monitor, connected digitally, ran an auto-reset function after I switched the connection to analog.

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