My firewire ports - Mac Pro running 10.4.9 have worked on and off since January. I have a firewire card reader and one hard drive. I ran the Apple Diagnostic test today and it said there were no problems. I repaired permissions, shut off the Mac, unplugged all cables, waited an hour and turned it back on with no firewire devises present. I added my firewire card reader and nothing was seen. Here are two screen shots. The first shows what the firewire section of System profiler looks like when my firewire was working - and it did after I installed 10.4.9, and the second shows what it looks like now. At wits end: Good http://www.nhbungalow.com/nc/firewiregood.jpg Bad http://www.nhbungalow.com/nc/firewirebad.jpg Can anyone tell me other things to try? (Besides buy a usb reader and usb case, or buy a firewire card.) Allan Nashua, New Hampshire www.nebirds.com