My Macbook (the unibody aluminum version) has lost its internal speakers. When I open System Preferences -> Sound -> Output, all I see is "Digital Out". If I plug in a pair of headphones, this switches to "Headphones". I don't see "Internal Speakers" at all any more. Headphones seem to work fine.

In System Profiler -> Audio -> Available Devices, I do see "Speaker: Connection: Internal".

I just clean-installed Snow Leopard, so it appears to be a hardware problem.

Is there anything I can do to fix this, short of taking it back to Apple? It's out of warranty.