Default Sound Pref changes on re-boot! WHY????

After upgrading from 10.5.x to 10.6.8, every time I boot up my iMac 2.4 Ghz Inte Core 2 Duo, the System Preferences Sound OUTPUT changes from Internal Speakers to my external mixer (Tapco-Link.usb)!!! HELP!!!!

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Clarification Request
Link to similar question.
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no such pref files in either library. preferemce folders

the only one i have is:
should I dump that????

by the way...THANKS for your're the only one, so far!!

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But your machine, your choice.

But I do the new account test... far too often.

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