Hi everyone! Just came to me a MacBook Air with this power problem. Normal press button to start doesn't work if battery is unplugged or discharged. Works fine with charged battery. MagSafe doesn't give any light with or without battery (same symptoms with diferent charger). Won't charge battery (diferent battery and diferent MagSafe same symptoms). Changed the MagSafe connector unit in the mac air and does the same things. Tested the MagSafe connector with another same model mboard and it works normal, green and orange light when charging battery in MagSafe. So, narrowed to the mboard, and surely it's a problem in the power/battery zone. But I don't know what cold be the component in it that causes this. Can anyone enlighten me of what could be the source of this problem? Thanks.