I have a Powerbook Ti 500 MHz, and all of a sudden the firewire doesn't work properly. I have 2 firewire devices I use regularly. One external hard drive, and one external CD-RW. When I attach the Hard Drive, I see the light on it light up, and here it spin, but it doesn't mount. When I attach the CD-RW, it locks the screen. The mouse curser sill moves, but nothing reacts. The Dock doesn't come up, the apple menu doesn't show, and even the Apple 3 finger solute doesn't work. All works fine as soon as I unplug the devices. I am at a loss. Is there any way I can "reset" the preferences in OS X to fix this?