I recently had a Gateway MS2274 laptop come in for repairs. It was totally dead. The hinges were in rough shape and some screws were missing. The power cord had broken and was taped together in two spots. I searched around and found another adapter but the laptop was still dead. I started taking it apart and when I located where to power button plugs in I jumpered my screwdriver across it. The laptop powered on and worked! So I went on eBay and purchased a replacement.
To disassemble it there is a screw hidden on the backside of the screen hinge as well as two screws inside of the battery compartment.
Here is the removed power switch, actually just the cord to it was bad.