Intermittent "Input Not Supported"

A few days ago picked up a Mac Mini to make into a video server. I have it currently hooked up to my old PC's LCD monitor (17" Envision cheapy from when LCDs first became affordable 5 or so years ago) while I work on converting my DVD collection to it.
A number of times, when the monitor comes back on (after it times out), it will show as "input not supported". I turn the monitor's power off and back on and eventually it will bring the display back. A couple times it was somewhat scrambled along the bottom edge also.
I have the display settings to a resolution that works with this monitor and OSX automatically detects the display (EN-7100e).
I haven't used this monitor much recently, but when running on the old PC didn't have any issues with it. Would OSX be confusing it possibly when awaking the monitor? Have others experienced this issue?

Now that's an interesting data point. The mere act of viewing the mini's screen from a remote client should not cause any change in the video output of the mini. There is definitely something strange going on.
Here's a question: if you cold boot the mini while it is connected to the Envision, but the Envision is powered off, and if you then remotely connect to the mini from the MBP with the Envision still off, what screen resolution is the mini running at in that case? Also, if you look at Display's preferences on the mini from the MBP (Envision still off), does it indicated the Envision is attached or not?

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