Computer does not charge or turn on if battery is below ~10%

My Late 08 Aluminum Unibody Macbook has recently had a pretty distressing problem.
If I unplug it from charge, if it runs completely out of battery (so that the computer forces itself to turn off) it will not turn on again. If I plug in the power cord, there is no bright green light (there is a very dim green light). The computer will not turn on even if it is plugged in and the battery is removed.
The workaround I have discovered is that if I take my battery out of my macbook, and put it into my friend's same-model macbook, I can charge the battery back up to about 12%, and then put it back in my computer and start it up. It will then charge up completely, and I am able to use it as long as I plug it in before it reaches about 10% battery.
I went to the apple store to try and fix this problem, they checked out my old battery, which seemed fine. They then put a new semi-charged battery they had in the back, and it started up fine (because it had some charge) so I paid for a new battery and left. So sad I was to discover my problem still existed. All of my friends with the unibody macbooks I have are away at college so my traditional method of fixing this problem for myself is unavailable.
Any ideas on what's going on?

First, try resetting the SMC:
http://support.apple.com/kb/HT3964?viewlocale=en_US
Second, try a known-good MagSafe charger. The dim light on the one you have--and that the Mac will not start at all while plugged in without a full battery--makes me suspicious that it's your charger.
It may also be a problem with the MagSafe port or the motherboard. Hope for the charger.

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Computer does not charge or turn on if battery is below ~10%

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