Won't Charge, Light stays green.

I searched and could not find an answer for my problem. I have a Mid-2010 Macbook Pro. I recently upgraded the RAM and hard-drive. Now my macbook pro will not charge. It is working when it is pluged it but the light stays green and will not go orange. The power seems to keep the mac running but will not charge the battery. I did unplug the battery when workind but have checked and it is reconnected secure. Thanks for any suggestions!