Replaced Charger, Replaced backup battery, replaced main battery.
My axim will not turn on at all

Everytime I put it on the charger the power button goes from red to green, indicating that it is fully charged. But when I remove it from the charger, even that power indicating light turns off, and it does nothing.
Stangest part of it all, is that it worked over night when I put the new main battery on it, so I left it plugged into the charger over night and in the morning it started doing the above mentioned.
Any one have any similar experiences? Any suggestions?
thanks.