Hello, My Firewire Ports are completely dead - both the 400 and 800. Under System Profiler, it says "FireWire Bus: Warning: Unable to List FireWire Devices." Last night I was trying to use my comp in Target Disk Mode, but couldn't get it to work. Prior to that, they worked fine. Is there any way I could've burned them out attempting Target Disk Mode? I was only attempting to use the 400 for TDM, but now neither port is working. I just upgraded from 10.4.11->10.5.1, but the ports worked fine for the first week of 10.5.1 - I did a full Time Machine backup on my 800 port. I've since had problems with Leopard (system would crash when it went to sleep - see other post) and assumed this was another issue due to Leopard. But I've erased the drive, reinstalled Leopard fresh and the ports still don't work and I get the same error in System Profiler. Could anyone tell me any suggestions? I've never heard of FireWire ports/buses just "burning out" - is that even possible? What could cause it? Many thanks.