My 2009 iMac does not show any firewire ports in System Profiler. When I plug in an old iPod that is firewire it charges but is not seen in Disk Utility. I was hoping to restore that iPod but think the hdd is bad so that is no longer important. But what is important is that when I attach a mac mini in target mode my iMac does not see it. I then used my install disk to use Disk Utility and it sees the mac mini in target mode. Is this a software issue? I had previously installed Firewire SDK in hopes of recording from my DVR. I could never get it to recognize the DVR. Did I cause an issue with the firewire port? Can the firewire port be reset? Can the Firewire SDK just be put in the trash to fix the problem? Do I need to re-install SL?