Why won't my Mac & Logic Pro detect my input device(s)?

Hey,
I'm using a macbook with OSX 10.8.2 and Logic Pro with a steinberg interface. I have also tried a tascam interface that was given to me by a friend to try, but I still have the same problem:
Logic doesnt detect either of the interfaces, and neither does my mac. However both interfaces detect the computer as indicated by their LEDs. I can switch on things like phantom power on the interfaces themselves, so the connection is live, but neither the computer nor the program can see them.
I have used this exact setup in the past, but it's been over a year since I used logic and now I'm out of practice and just stumped.
Any help?

Alright.., I will try this and hope i´ll do it right. My (a little older ) MacBook Pro has the same problem, it just wont shut down. Things works kind of fine until I shall shut it down, cause then the wheel will spin and spin and spin (and it goes to sleep still spinning), so it must be some corrupted files or app that is stuck. I just bought MacOs10.6.3 to reinstall or recover the harddrive, but I´ve never done these things on a Mac before. I have formated in Windows alright, but I am worried about the drivers, I dont know how to back them up! ??? Where do I find them? I hope I dont have to wipe the disc out fully, that it helps with just some cleaning up. I will come back after my "operation".. please wish me good luck! I really dont want it to crash completely.. Thank you for all the information I had here. See you soon.. '
/ Maria

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