Mac Mini Duo Core 2 + Westinghouse LCM-19w4 using DVI-d

Had been running my Mac Mini using the dvi-to-vga adapter into the vga port of the Westinghouse monitor. No issues. Today I purchased a Dynex DVI-d adapter and changed the connection to use the DVI-d connector on the monitor. These are 'single-path' cables.
On power up there was no signal recorded to the monitor. Subsequent attempts to startup in 'safe mode' produced nothing either. I tried something different, I put the Mac Mini to sleep (light touch of the power switch) and then woke it up again. Upon waking it up the monitor came to life showing the screen properly via the DVI-d cable. I reviewed "System Preferences" but could see nothing about DVI-d only generic monitor and screen resolution settings.
I powered down, then back up again, no screen was seen on boot-up. This time I simply put the unit to sleep again, then woke it up and presto, there was the screen perfectly displayed. So I've disabled my screen power off until I can figure this out.
Should I re-install the Mac OS X so it picks up the new DVI-d/monitor settings? or is there a change I can make to the OS manually?
thoughts?

So you are no longer using adapters, correct? The Dynex is a full length DVI-D cable?
It might have something to do with the input select on the Westinghouse. It may be set to be looking for video primarily on the VGA input. Or it may be in some kind of auto port scan mode where it is trying to look for active video on it's inputs and maybe this is failing somehow. If that is the case, see if there is a way to turn off auto port scanning, or else if there is a way to set the input to be permanently DVI on the Westinghouse.

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