The PB 5xx power adapter has 2 circuits--one for
running the PB, the other for charging. Sounds like
your charging circuit is fried. You can test your
adapter with a voltmeter and a paper clip. Don't worry
about electrocuting yourself--the output maxes at 16v
DC. Slip a paper clip into the top 2 holes on the plug
(as it sits in the PB) that inserts into the PB. Do
one hole at a time. Touch one probe to the paper clip,
touch the other to the semicircular metal ring on the
outside of the plug. Each hole should give an output
of 16v. The bottom 2 holes are grounds. If you get
less than 16v, it's time for a new adapter. These are
pretty cheap on eBay. 

Some PB 5xx's do suffer from a weakened solder
connection where the power adapter receptacle attaches
to the motherboard--it depends on how roughly they
were treated when the adapter was plugged in. If this
joint is weak you can also experience battery charging
problems. If your adapter checks out OK in the
voltmeter test but you still have charging problems,
try this: gently wiggle the power adapter plug where
it inserts into the PB. If your monitor intermittently
displays the charging symbol while doing this, then
it's time either to find an electronics shop to
re-solder the connection, or shop eBay for a new
motherboard.  

Cheers,
Don Silver

--snip--
>It powers the PowerBook fine, it just won't charge
the
>batteries.

=====


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