Soory...first time user, hit the the wrong button.
I have a laptop and added an additional monitor, I had the additional monitor set up as the primary monitor (it is to the right of my laptop so it was #2) It has worked fine for the last year or so. Yesterday we had a power outage and the #2 monitor dropped out.
Now I can get it to recognize the #2 monitor but...if I try to change it to be the primary monitor it droops out, I can get it to recognize it again but every time I try to change it to the primary it drops out.
I've checked all connections and restarted the computer.
I have a Dell Trinitron attached external monitor, that I was also having trouble with. To fix: In Display, select the Settings tab. Click the Advanced button. Choose Intel Graphics tab. Click on Graphics Properties. Under Multiple Display, reverse the primary and secondary monitors. This will bypass the non-responsiveness in the Display/Settings.
Thanks slick-2. I went thru your instructions and that looks like it would work. I'll keep that one handy. As you can see from my post, I had done a system restore to correct the problem but... your way is a lot safer.