Intermittent external monitor

I have a brand new Intel based iMac 24" that I want to connect to my several month old Dell 22" widescreen monitor. I have the mini-DVI to DVI adapter. The monitor has three inputs, VGA, DVI and HDMI. I initially tried the HDMI (so I could keep the PC hooked up to the DVI and switch between the two) and after figuring out to set the monitor to RGB input rather than component video, I got a nice picture from the iMac.
However, it intermittently goes black, then comes back. There does not seem to be a pattern or relationship to any particular running app. There is no indication that anything is wrong from either end (I don't see a "no signal" on the monitor). Sometimes it will work fine for 10 minutes, sometimes it goes on and off every few seconds. I switched to using the DVI input on the monitor and left the PC disconnected, same result.
I hooked the monitor back up to the PC and it works fine.
Any ideas?

I'm having the same issue with an iMac 2.66GHz Intel Core 2 Duo, and a Dell 22" widescreen (2208WFP) connected via Mini-DVI-to-DVI as well. But when mine comes back on after about 2 seconds of being black, I have a small "DVI" image in the top right corner, as if it had just auto-detected a signal on the DVI input after having lost signal previously. The symptoms are the same: might go an hour or longer with no issues, yet sometimes it might happen every couple of seconds. What I did notice when it was happening every couple of seconds was that it did that when I was on a web page that had a very busy advertisement (ie, one of those "Flash" ads that is offering you a free seizure by flashing green, red, and yellow). I was able to switch tabs in Firefox to a blank tab, and it stopped happening. The second I went back to the page with the ad, it started happening every couple of seconds again. That's the only time I've been able to reliably replicate the problem. But this never happened with the same monitor on my PC, viewing the same types of ads, nor on the iMac with a Dell E228WFP monitor. Seems to only happen with the iMac and this monitor (from what I'm capable of testing)

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