Mac Mini PPC Audio Problem

Hello for everyone!
My name's Michele and I'm an Italian's Student (sorry for my bad english )
I have a problem with my MAC Mini PPC.
Under Tiger 10.4.11 OR Leopard 10.5.5 (every version and every update) the audio works and not works!! (for example: I booted my mac mini, the audio works correctly! After 10 minutes, the audio don't work... O_o)
After another 30, 40 minutes... the audio works now!
Under System->Preferences->Audio the settings are right, and in the sidebar (on top) the audio's icon it is activate!
Where is the problem???
Help Me please
Thanks!!

sorry

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I listened to the xitel for a few minutes and determined that it sounds pretty similar to the iPod...but where as i could have listened to the iPod all night without feeling like i needed to EQ anything, i found myself wanting to use the EQ to try and open up the sound more.
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But lets go back to the your original post and add "rock" EQ to the mix....I will say before i turn it on that i found that EQ settings felt wonky to me on the mini yesterday...if i pushed anything to hard it would distort badly..
On to "rock"...with tigerlilly it just pumps up the base somewhat and makes the vocals louder...but it does not distort or sound unaceptable to me...
On the the iTunes store to test "blew away"...
does not sound great to me...but is that the recording or the mini? You say its the mini...I will try the same song tomorrow at work on my 24: imac and report back.
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