Dell 2709W blinking out

I'm having a problem with my montor.  Intermittantly it will black out the screen for a second and come back on with a small DVI symbol in the upper left corner of the screen.  I've searched for info on this and seen a few others with this problem across various monitors, but with no real solutions.  I've tried to do as much troubleshooting as I can think of to narrow it down, and as far as I can tell, it's a dvi / hdmi issue, maybe EDID with the monitor? 

I'm running a new system with the monitor, and have tried hooking a Samsung monitor to the computer and have no issues at all with it, which leads me to believe it's the dell monitor.  I've checked and tried most settings on the video card to see if I can affect the issue, but to no avail.  The blinking is happening fairly regularly, going only 15 minutes at most without blinking and at times will do this 3 or 4 times in a row and only a 3 or 4 minutes between instances.

I've tried hooking up the dell single dvi cable into both ports on the monitor and the video card.  I've bought a dual link dvi cable and had the same results.  I've tried using the dvi / hdmi adapter and using the hdmi port with the same result.  Interestingly, using the dvi / vga adapter and hooking to the vga port seems to fix the problem, though I'd like to run that a bit longer to see if it truly does fix it.  However, VGA is not an ideal solution and didn't really want to use it when DVI / HDMI should be working.

I'm using an ATI video card, XFX 4890 series.  The monitor is rev. A02 manufactured March 2009 in Mexico.  I bought the monitor through Dell Canada and have tried to phone the 1-800 technical support number but get a message saying, "We are having technical difficulty, please call back later" and get disconnected. 

Has anyone come up with a solution to this problem, or should I just keep trying the 1-800 number and hope to get through?