Thanks for the help. I did try the procedure just as you described and per the Dell tech. Still nothing. So, for the third time, they are sending me another "refurbished" monitor which will only last for 3-4 months and then I'll go through this again.

Hi, I too had this problem with my 20" Dell Widescreen, at first I thought it was a bad video card or monitor or even a bad DVI cable, but after many tests, (having dell send me a new DVI cable and trying other monitors) I talked with a dell rep and he told me to shut everything down, PC and Monitor, then first turn on the monitor, then the pc, I didn't think this would do anything, but sure enough right away I had picture. I guess it has to do with the computer reconizing the monitor, sometimes it doesnt catch it, but this should help, Hope it solves your problem!