New monitor not recieving signal via DVI, ok via VGA

Hello,
I have one of the original minis (1.25 GHz, 512 MB, etc) purchased back in early 2005. Until now I've been using an old CRT display connected via VGA. This past weekend I purchased a new 20" AOC LCD monitor from Costco. I attached it with the supplied VGA cable and it worked great. The next day I picked up a DVI cable, attached it and after a minute or two the monitor found the signal and displayed a beautiful image. After five minutes the monitor lost the signal and I haven't been able to get it back since. I exchanged the DVI cable for a new one, but still can't get a pic displayed. The monitor itself is self switching. It knows if the connection is via VGA or DVI.
What am I doing wrong? Could it be the mini? The monitor?
Please help.
Thanks
Dave

Yes, it is a display specific issue. If you look at this Apple spec page for the original mini and do a search on the word "coherent" it will take you to the part of the spec that deals with the issue.
http://support.apple.com/kb/SP65
Apple displays are not a problem because they have always used coherent receivers. But any other monitor is a roll of the dice, especially with the original mini. The newer mini with GMA950 graphics appears to be much less affected by this even though Apple left the wording in this part of the spec unchanged between the original G4 mini and the current Intel ones.

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