Motu Ultralite not working in PowerMac G5 any OS

I have a Motu Ultralite that is recognized in Audio Desk and Reason but does not produce any sound. When used as an output for iTunes it produces sound for about 1:45 then turnes to noise. I have tried most OS's from 10.4.1 to 10.4.10 with pretty much the same resuolts. I am using the latest Motu drivers. The unit works on other Macs but not mine. I have a PCI graphics card not the AGP one that comes with the MAC. I am using 4.5 gigs of RAM. The firewire ports on the computer seem to be ok when moving data to and from an external drive. Motu support could was no help at all. I am posting here because I hope to reach readers who use audio interface cards. Any help would be greatly appreciated.
Power Mac G5   Mac OS X (10.4.10)   4 G RAM, PCI Video Card

Hey, this is a tricky one. May I suggest trying the following:
1. Disconnect all other Firewire devices
- to remove the possibility of something causing a conflict
2. Try a different Firewire cable
- may be subtly damaged
3. If possible try another Firewire audio interface
- will prove that your Mac and it's Firewire ports are ok
- it's possible that when you're using a hard drive that if there are read/write errors OS X is doing error correction so you're not seeing any noticeable difference in performance, whereas with audio, it's a continuous stream and errors that are occurring you're hearing as noise
4. If possible try a different Ultralite
- will prove that your current ultralite is faulty
Basically, try to isolate whether the issue is with the Ultralite or your Mac.

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