have you tried the age old 'wiggle the plug about in the socket' technique? The fact that some speakers work and others don't would lead me to think the problem is with headphone/lineout sockets.
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2006 Mac Pro
Dual, dual core xeons @ 2.0Ghz each
2Gb Ram (I'm too poor)
NVidia Geforce 7300Gt 256mb
Onboard Sound - optical out to Logitech Z5500
Digidesign MBox2 output to PMCs
250Gb Drive running both Mac OSX and Windows on seperate partitions, 400Gb Seagate Drive for Windows, 400Gb WD Drive for OSX
24¨ Acer AL2416W (not nearly as bad as you'd think)
Various Lacie external drives
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