My 13" Macbook won't charge or power up. When the charging adapter is attached, the green light on the adapter plug is steady green, showing a fully charged battery, but the battery itself shows only one flashing light on it's own condition meter. It is a brand new battery so I'm sure it is not the battery. The computer will also NOT power up at all. It was working great until the charging system failed and the computer died due to the dead battery. When I attached my...