My macbook pro 2011 recently stopped charging. I reset the smc and nvram and when that was unsuccessful, I replaced the mag safe DC in board. It charged for about a week like normal and now it's back to not charging. I'm at my witts end with it. The plug goes light green unless I plug in my other Macbook first and then plug the mag safe into this mbp in which case it takes the orange glow for about 5 min but doesn't charge. I've tried several mag safe adapters and the resaults are always the same. The battery reads as working. Should I buy a new logic board or scrap the whole computer and start over?