My Mackbook Core 2 Duo 2007 Black can-not charge the Battery.

This Macbook is working all fine just that it can't charge the battery.

- The battery is good as I charge it externally with the External Charger I bought - meaning I can use my macbook for like 2 hours or so at one charge.

- Following the ifixit and some other forums I have now replaced the faulty part which is Meg Safe Dc - in but still it doesn't Charge.

I appreciate you guys reading this forum , please Suggest me something if you have in Mind.

Thank you, Joy.