Hello,
We have a Vostro 3500 that's not charging. (And of course the service contract we bought with it has expired.)
The charging jack seemed really loose so I decided to get a new one and replace it myself. It seems to have gone OK, and the jack feels much more secure when plugging the charger in, but when plugging the charger in the charging light comes on white for about 1 second and then goes off. And we have also tried with a different charger to make sure that's not the problem.
So at this point I'm thinking it's either the motherboard or the battery. Is there anything else I might investigate?