Horrificly fickle power input

(This actually pertains to a clamshell iBook -- apparently Apple considers 2002 too shockingly long ago to assign a category)
I've had this iBook for quite some time. About a year ago, my power adapter (yo-yo) sparked up and stopped working, so I replaced it. In February of this year, I purchased a new battery.
In May or so, I started noticing that the power connection between my second yo-yo and my iBook had become rather sensitive. It wasn't a big issue, I just had to be careful. By June, it had started to get seriously annoying, so I would just let it charge and use it unplugged. But early this month, the worst possible thing happen: my relatively new battery immediately stopped taking a charge (always in the red when unplugged -- shuts down within minutes; always shows 0% when plugged in). So since I had to keep it plugged in, I ordered yo-yo number three and received it last week.
To my dismay, the problem did not seem to be the adapter: even with this change, it's still really sensitive (especially to upward pressure) to the point where it's unusable.
I reluctantly realize that this is not something I can fix by going through some tutorial (already tried resetting the power management utility) and that this is a hardware problem. So I'm just wondering if other people have had similar experiences and, if so, what were the resolutions (and how much did said resolutions cost :-D).
Thanks.

That's probably what I would do.
Here are the instructions on how to do it yourself, if you would be interested in trying it, since you don't have a lot to lose:
http://www.ifixit.com/Guide/49.12.0.html
I do recommend that you check in the iBook (colors) forum, though. There is something on the colored iBooks called a "charger board." I'm not certain whether this is the same thing as the DC-in board or not. Someone in the iBook (colors) forum may be able to give you better advice and know of a less expensive repair facility.

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