''No output devices found'' message on my Mac Pro with Lion... Any suggestions? What should i do to resolve the problem?

I turn on my mac without hearing the chime boot sound from Apple.. after that im always turning on my Motu (extermal soundcard firewire) i still got that message, by audio midi setup my Motu appears from some minutes and then goes away again.. The same time that my Motu appears i simply start a mp3 file to check if i got a sound but still no luck... Made all possible updates but still no sound.. I'm using Logic pro 9 and have lots of thing here to do.. Try also a hotline from Apple to call but im waiting like more than an hour and still no answer... Please any suggestions? I am afraid it can be a hardware problem
This problem came for the first time after i made an update in Avid Protools...
After that i tryed everything and still got no sound... Next step i FORMAT my Mac Pro.. Back everything UP and reinstall Lion and still '' NO OUTPUT DEVICES FOUND'', i performed a clean install.. Thats why i am afraid it can be a Hardware problem.. So, if anyone of you guys know something about it, please share your knowledge with me..
Thanks in advance

Try a different user account and see if the problem persists.

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''No output devices found'' message on my Mac Pro with Lion... Any suggestions? What should i do to resolve the problem?

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