Hi, I have a rather weird issue: The MacBook 3,1 (mid 2007) model sees and chargers the battery just fine. I can see the cycle count etc. However, when I remove the AC charger, the MacBook shuts down. It also can't boot of only the battery alone. It seems, the MacBook can't run of just the battery, Does anyone know what might be the issue? A summary of the problem: * Macbook sees the battery, will charge the battery until full but will shut off immediately if it is unplugged from the AC adapter. * Macbook will not boot up unless plugged in. * Battery shows up fine in the computer and fully charged. I can run another laptop off of the battery and it works fine. * If I put a new battery into the broken MacBook I have the same issues. * I tried swapping out magsafe adapters and same problems. * Resetting SMU and PRAM does not help. Thanks!