"out of range" after sleep

The only way I can get my monitor to work with the mac mini is to set the display settings to something compatible like 800x600 at 60hz (while attached to another monitor), unplug the display at the wall, boot up the mini, then plug in and turn on the display after the boot process has finished.
But as soon as the mini goes to sleep mode, the display will not wake up again - it shows the "out of range" warning. (This is also what happens when the monitor is plugged in from the start).
I have deleted all the windowserver.plist files several times, but this does not help.
Any suggestions please?
Thanks in advance.

I am not able to find much info about that monitor on the web. From what little I have found, it does claim to support plug and play, which is crucially important to a Mac. But I am suspicious about the state of its plug and play driver based on the experience you are having.
If you feel like going through the trouble, download and install SwtichRes X Control Panel (not SwitchRes X the full version). It has the facility for turning a display's driver data into a human readable text file. You click on the "Export DDC" button to make the text file. If you post the resulting text file here, I will help you read it to see if it is the source of the problem.
The other alternative would be to return the monitor for your money back. Just curious, but is Mac compatibility mentioned anywhere in the user manual or anywhere else? Does Advent have tech support, and have you tried calling it?

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