Hi My MBP is recording a terrible noise (a loud buzz) when using any firewire audio interface. I have tried M-Audio 410, Ozonic and Profire. I have used these audio interfaces with previous models of MBP and have not had this problem. I do not have this problem with my iMac Core 2 Duo, however it is not usually practical for me to record with the iMac. I have AppleCare and returned it to Apple - they replaced the logic board. I still have the same problem. Any help would be greatly appreciated. I am tearing my hair out Thanks!