Hi, My macbook pro has just started doing something strange. I can charge it up to full capacity (which is working, I tested with Coconut Battery and all seems normal) but when I removed the plug from the notebook it just clicks and shuts down. If I try to reboot (while still unplugged) it will try to reboot and then after 2 seconds clicks off again as if I were to hold down the power button for an emergency shut down. All is fine once I connect it to a power source though. Any suggestions on trouble shooting this? or past experiences? thanks!