I bought a mid 2010 Macbook recently and was told it had no battery - the original battery had swollen and caused a tiny amount of damage to the case. It will not charge the replacement battery I just put in. Why? It sees the battery in the System Profiler and in Coconut but up top by the battery icon it says it isn't charging (in grey). The Coconut app says the battery is at 74% but when I pull out the ac adapter it dies. So far I installed the OS (I'm running 10.6.8 because I use an older Photoshop, it had been running Yosemite) and tried the ac adapter from another mid 2010 Macbook. I tried taking out the battery and holding down the power button for 5 seconds as I read that resets something. I tried leaving it plugged in overnight. I cleaned the adapter contacts with Deoxit. My next step is probably to take the battery out of that second Macbook and install it in the new laptop with the thinking that perhaps the new battery is bad. Any ideas? 7/21/16 UPDATE: after reading some other threads here and seeing that a magsafe board is only $12 I'll probably order one to take the chance that it is the culprit. UPDATE: I found one for $8 (including shipping) and will post the results when it's installed.