My macbook battery won't charge and the magsafe light is always green. The battery is drained and the macbook seems to be running on the power adaptor. This just occurred yesterday night there were no previous problems with the macbook. After a mere 20 minutes running on the power adaptor the macbook shuts down and won't turn on. After a while it turns on again and the battery still doesn't charge. Has anyone experienced this? I don't have applecare and i've gone past the 1 yr.