My mag lite led xl100 will not turn on, have fresh batteries installed

I have found a YouTube video that may help you. Search for:

Maglite® XL100™ LED Flashlight Demo

That is normal for a mag light.

Hello, don't bang on the mag lite. Take a four inch deck screw and screw it into the battery one a time. Once the batteries are out. Mix up some water and baking soda.paste Take the soda paste and applied inside the tube around the corrosion areas. Rense with water and paste serveral times until the inisde of the tube is cleaan. Remove all components from mag lite be starting this operation. Wipe out with clean cloth and skake until al lwater is removed. GB ....stewbison

make sure battery is good. Did you install batteries correctly? flat side (-) in first. Try adjusting the head where it screws on.turn in both directions. Last if this doesn`t work -return it for an exchange where you bought it..
hope your not in the dark..

replace the bulb

http://www.takeitapart.net/archives/mag-lite-2d/

I've had the same problem, even took a new Mini Mag back to the store, only to get another one doing the same thing.....finally realized that the batteries that came with the flashlight were not good. Fresh new batteries solves the problem.

There are diffferent mag lite bulbs made for different amounts of batteries. Be sure that you have the 5 cell light bulb. Also try to keep your fingers off the glass. if you get any oils on it, wipe it off before turning it on.
Also you can get mag lite specific bulbs...they cost more but they're worth it.

I have a regular AA Mag light that had industrial strength batteries which corroded.I did get them out but the bulb holder on the light broke.(The main bulb holder where the twist on switch is.)