Battery icon showing "no batteries available", not charging

Hello,

I bought a used 2008 Macbook (2.4ghz Core2duo) that only worked while plugged in. Thinking the battery was bad, I ordered a new one. After noticing it didn't detect either battery (X over the battery icon, "No batteries available") and nothing showing up about the battery in the system information screen, I ordered and replaced the battery cable that connects to the logic board. It now runs on the new battery (it didn't before) but since it's barely charged it only lasts for a few seconds. Even when it's running on the battery the system still shows that no batteries are available. I've tried resetting the SMC using both batteries and a different charger but I really can't figure out what's going on. The charger turns orange for a few minutes but then turns green. Am I doing something wrong? Could this be a bad magsafe board or is this looking like more of a Logicboard problem? Any help short of going to the Apple store would be much appreciated.