ITunes plays but no sound/Loss of sound control in audio output

Two problems have popped up since I had my logic board/power supply replaced, and had 1G of memory added this week.
First, I imported a new CD into iTunes - it took almost 3 hours! Now, iTunes "plays" my music (all music - not just this one CD) but there's no sound.
This led me to discover there's no sound in any application - so I check the System Preferences, and I can't control the volume bar (drag with the cursor).
Before this occurred, there was a brief moment when a file I played in Quicktime did play - so I know the speakers work and are connected. But none of this was happening before I had my logic board replaced. So my questions are:
1. How do I get my sound working again? And
2. Is this related to my logic board problem in some weird way?
I have to say, even though I just added a 1G of memory yesterday, operations on the machine still seem slow to me.
Thanks for any guidance!
Chris

I got a response through another question I asked on the discussion board, which was answered.

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ITunes plays but no sound/Loss of sound control in audio output

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