Mac Mini doesn't always recognize display type

Sometimes when I reboot or wake-up my mini, my monitor (Viewsonic VX2245wm) isn't recognized. There is no option in System Preferences-->Displays for the recommended resolution settings (1680x1050) when the monitor isn't recognized. The monitor name isn't shown at the top of the Display pane when this occurs. When the monitor is recognized, the display name is present at the top of the pane. Without the appropriate resolution, the display is stretched and fuzzy.
One potential issue is that the mini is connected to a VGA KVM switch? I use a DVI to VGA converter on the Mini so that I can connect it to the KVM. Could the KVM be preventing the mini from recognizing the display?
Is anyone aware of any methods to solve this problem?
Thanks in advance for any suggestions.

If resetting the PRAM worked, then there would be no reason to have to reboot would there? If it still happens after resetting PRAM, then that didn't fix it and the problem is elsewhere.
I doubt a DVI KVM would help, though if the issue is in the DVI/VGA adapter (some are a little less solid in their connection than others) then it obviously would - but then so would replacing the DVI/VGA adapter! However, if the problem persists, it's still worth testing with the display connected directly to the mini to help rule the KVM in or out of contention as the cause.
Aside from PRAM, where the system keeps a number of required settings, there are also 'properly list' files on your system which control how the system and all the parts of it, plus software components are configured. These are the 'plist' files you may have heard about. It's possible you have display-related plist files that are problematic. There's a simple utility called Preferential Treatment which can be downloaded (www.versiontracker.com is a good source) and which can then check all user and system level plist files for damage or corruption, allowing you to remove any that are. This is worth running.
In addition, there are specific files that control how MacOS connects to and configures displays which you can find and remove manually. If you go to the Finder's edit menu and select 'Find' then search for 'windowserver' (no quotes) you should find 2 or 3 (including one with a string of alphanumeric characters). Delete all that it finds and reboot. Replacements will be created. This often helps with inconsistent display behavior.
Lastly, one thing that also sometimes works is to allow the system to boot up with NO display connected, then when it's running normally, connect the monitor. This forces the system into attempting to detect the display properties, and in some cases once done, inconsistent failures previously don't return.

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