>> Hello John. Internal only. > > What else is connected to the G5 via USB or Firewire that uses its own > external power supply? Anything? > > How is your audio interface powered? > > Basically, you start disconnecting stuff and note at what point the > noise goes away ... it's no fun. > > John Pitcairn > a friend of mine has the worst problem with her G5 using a firewire410. she has tried everything reagarding electricity, nothing helped. she gets a very bad resonance noise through the firewire audio device that we thought to be a earth loop noise at first she is not using any other firewire or usb equipment the firewire410 is powered via firewire but the problem is the same if it is adaptator powered the only additional part is an internal extra harddrive.. SHe can hear the whole CPU work and hardrive and fan through the car! putting down the powermanagement to low of course reduce a bit the noise but then what's the point? we have tried her card on my g5 and even if we have a bit of resonance, it is very acceptable (it's about the same on her ibook) I have asked other 410 user and they told me they have this if they amplified the output really high, but other wise they don't really hear. It reminds me of the bad isolation problem of the built in audio output of some of the mirrored G4... K