You've got me a little worried. I have a 1.25 GHz G4 Powerbook and just got the M-Audio USB Audiophile. Hope it doesn't crash my computer. What do you mean when you say, "crash." You mean, like, have to re-boot, or do you mean, like, have to take it in for repair? You've also got me looking for other sound-cards just in case this thing causes problems. The Apogee sounds like a nice unit, but it costs $1,000+. I'll be curious to hear if others know of alternative USB or Firewire DA sound cards that are Mac compatible.