HOW CAN I FIX THE SOUND ON MY IISI?  (9.2)
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       When the metal fingers that connect the IIsi speakers and the 
  motherboard get rusty, sound can blank out completely.  This may not 
  occur until the IIsi has been running for several hours.  As a quick 
  fix turn the speaker volume all the way up and then down again.  
  This sends a small spike of electricity across the contacts and 
  should temporarily dislodge the rust.  If this doesn't work a whack 
  on the side of the Mac may also clear the contacts enough to restore 
  sound.

       For a permanent and easy fix plug a pair of external speakers 
  into the sound out port.  I've heard at least a dozen different 
  suggestions for permanent fixes to the internal speakers.  The only 
  thing all suggestions have in common is taking the speaker 
  subassembly out and putting it back in again.  When you're having 
  trouble with electronics, there's just no substitute for pulling 
  everything apart and putting it back together again, and that's all 
  you really need to do to fix the sound on your IIsi.  The speaker 
  assembly is hidden under the hard drive so take that out first.  
  Once you've removed the hard drive, spread the four tabs that hold 
  the speaker assembly in place and slide it out.  Then clean the 
  contacts with isopropyl alcohol.  Even rubbing them hard with a 
  paper towel or lightly with sand paper should dislodge enough rust 
  to fix them.  You can even coat the contacts with an anti-oxidant 
  like DeoxIt or PreservIt to prevent future problems.  You should be 
  able to find some such compound at any electronics supply store.