Duo and battery

[Philip Mrozinski]

I've been having some recent problems with a 280c. It won't boot while 
inserted in my Dock anymore (my 2300c works fine in the Dock), won't 
boot with a battery inserted (a known good one), won't boot with 
battery installed and AC adapter plugged in, will boot and work 
perfectly if I remove battery and just use the adapter. Not a huge deal 
because I don't take it on the road anymore and rarely use the Dock. I 
guess I was wondering if the logic board or something else is starting 
to go. This little guy has been a good and loyal friend over the years 
and I'm not ready to put him down yet.
Thanks for any input.