How do I turn on the Dome light in My Denali

Just purchased a 2001 Denali. Last night I was able to turn on the dome light by pushing the dome light override push button but for some reason I can't get it to come on now. Tried the override button, dome light dimmer thumbwheel, nothing. Bought the truck used of course and the dealer is in the process of getting me a manual. I am sure it's covered but in the mean time, has anyone else had this problem?

Have you gone to mygmlink.com to look at the manual? I'm still figuring out my new 04, so I will be of little help to you... sorry.