Cooling Fan running constantly/not detected by Fan Control Apps

I have an older unibody 2008 Macbook with a fan running fast and constant. Initially the battery died completely and this somehow prevented any boot up for the computer, dead battery installed, or removed. I bypassed this by holding the power button down while attaching the magsafe, released the power button, pressed it again, and it booted up. Except the fan was full RPM and constant.

So far I've reset the SMC, PRAM, checked all connections, and even installed some fan control apps, but they don't even recognize the fan at all. Using Activity Monitor, I've detected no stress on any part of the system. The mac was factory reset before it the battery issue arose.

Hoping it's not a problem with the logic board, maybe a new fan?

Thanks

Well... this is a bit concerning... here's the screen shot. I installed the trial on both this macbook and my newer one, I get the readings on the new mac, but the old one with the issue has no data at all.

after messing around a bit. I can get TG Pro to read the HDD temp etc. But, nothing else at this point. Doesn't even register a fan.