Hello. I'm having some serious issues with my Mac Mini and my new Acer AL2016W monitor and I found this topic through Google and it looks promising.
The main problem is... I've pretty much screwed things up beyond anything discussed here thus far.
The problem started when I installed SwitchResX to see if I could get the monitor to run with DVI rather than the (slightly fuzzy) VGA and tried to apply a custom setting. I'm guessing I input the full resolution values at the top without knowing I should have subtracted the horizontal and vertical values as well as screwed up the refresh rates somehow.
Regardless of what I did, my monitor doesn't work anymore and I can't see a thing. Every time I plug it in, it tells me that there is either no signal, or that the image is not supported. And this applies not only to DVI, but also VGA as well... which is what really bothers me.
I've tried resetting the P-Ram (By holding down the Command-Option-P-R keys until second startup chime), the PMU (By shutting down, unplugging, holding down the power button, plugging in, releasing the power button, and starting up as usual), trying to boot in safe mode (by holding down shift right after the chime until startup completes), and a combination of resetting the P-Ram and PMU, but all have the same non-effect.
I even hooked up a different monitor (VGA) that worked and tried to uninstall SwitchResX to see if I could at least get VGA back on the Acer AL2016W, but every time I plugged in the Acer AL2016W after the SwitchResX uninstall with either the VGA or DVI cable, the Mac Mini would still reset to the old custom setting I had tried so hard to erase by uninstalling the program with the unintaller and following the FAQs (Question 6) for SwitchResX.
So anyway... in my ignorant attempts at resolving this issue, I tried reinstalling SwitchResX and made it so that now my other monitor doesn't work either. And I'm hesitant to plug in my third (and final) monitor and mess with anything.