First: try blasting the switch with some canned air and try starting it with the AC adapter. So far as I know a dead backup battery won't cause the no-start problem.
It could also be the shut-down-as-soon-as-turned-on problem.
See Sean Luke's extensive page on this problem and various fixes at:
http://www.cs.umd.edu/users/seanl/newton/MP100Power.html
Peter
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