Stopped recognizing after res change

Limited info here as I am helping my father long distance. Here are facts as I understand:
1. mini was working with a particular external monitor, but a program recommended a res change and stopped displaying after that.
2. Said monitor does work with his PC so he wrote down the desired resolution according to the PC
3. Successfully recognized his flat screen TV and went in and set resolution to PC recommended
4. Tried Mac mini again with problem display, but no luck
He says that an Apple tech told him he needed an apple keyboard to solve this, so he went out and bought one. Why was this recommended? Is there a force 'detect display' key combination?
I am going to try to help him over the phone tomorrow. My main idea is to get him to boot up with the flat screen and then go and delete the com.apple.windowserver.xxx.plist file from main library prefs and from the user account.
Does this sound liek a good plan?
Other ideas?
thanks

Hi guys - I'm having a similar problem with my Mac Mini at the moment. I recently accepted a software update which affected a number of applications - I'm not sure whether or not the update expressly included a res change, though. Having downloaded and installed the various bits and pieces my Mac hung. I held down the power key until it rebooted; now when I load it up it makes the chime, shows the white screen with the Apple logo and then the mid-blue 'wallpaper' screen, but after that all I get is a black screen with the occasional flicker. I tried resetting the PMU but that hasn't seemed to do anything.
I use a Monster DVI > HD converter, a Monster HD cable and a 42" LG LCD. My keyboard is the standard wireless Mac affair. My OS is up to date but since I can't read the screen I can't confirm the exact version reference; the Mini is about 20 months old.
Can anyone help?

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