Can't play any media on 10.6.4!

Yikes! All of a sudden, in the last day or two, I've lost the ability to play ANY media file on my mac mini with 10.6.4! I've downloaded some video from my iPhone 4: the video is there, I can scrub to any point in the video but when I click Play, it flashes briefly to Pause, then the icon reverts back to play. I click play in iTunes, I see the indicator that iTunes should be playing the song, the play button changes to pause but the slider never moves, the music never plays!
I'm posting this here because I don't think it's specific to any one application. I move a video from the iPhoto archive to the desktop and it still won't play. I can scrub within the file in QT Player, but it won't play!
No new downloads of note, though I did upgrade the mini's memory from 2 gb to 4 at roughly the same time. Everything else seems to be working normally.
Would appreciate any insights! I've restarted and repaired disk permissions.

Turned out the problem wasn't QT at all. I did some additional investigation after I posted my query and discovered that, in the Sound control panel, NO devices were listed. I knew that was a big problem, and likely related to my memory upgrade in the mini a few nights before. Sure enough, it turned out that I'd failed to connect the little copper colored strip you see when the lid of the mini is popped up. Problem solved. Mac mini memory modders beware!

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