FW800 port not connecting

Hi all, noob here.
So I have a 15 inch powerbook that is only a few months old. I've been editing a few video projects in FCP and everything had been going smoothly until today. I have a 4TB G-Raid external hard drive and 2 portable 500GB Lacie external hard drives.
I had the 4TB hard drive connected and went to daisy chain one of the 500GB externals. Oddly enough, it kicked the 4TB off but still connected the 500GB. Since then, I have been unable to get the 4TB to connect, either through USB or FW (the only 2 options). I am also unable to connect either of the 500GB hard drives through FW but they will work through USB.
Has anyone experiences this? Someone had mentioned Disk Utility to me. How do I give that a go?
Thanks all!

You need to reset the Firewire Bus I suspect, if I recall correctly you need to remove the battery and power supply for at least 10 minutes (with all peripherals disconnected too of course) then reconnect everything and power it up.
http://support.apple.com/kb/HT1151?viewlocale=en_US

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