firewire port not found

looking into the about this mac menu, I see that my mac does not find its own firewire port. "no firewire ports were found"

I would like to make this port operate . Any ideas?

I have tried various keyboard solutions and tricky restarts. No Help.

Can you help me test the port..with test tools..or perhaps replace the port????

I have read that desk tops carry a small battery that may need replacing does my laptop also have a small battery to preserve settings? Can I replace it?

10.10.5