Thanks, folks. And thanks for the link, Tony. They only appear to have a repair kit for a couple problems relating to my printer, but that's okay. I've posted my question there too, and hopefully some nice person will respond.

Any advice on where to get a replacement toner cartridge? They don't seem to have my model on their list, unless the one that works for the III and IIID will also work for the IIIsi. It seemed pretty specific, though. And hey, if $39 is all I have to spend, I have no problem replacing it. I thought it was far more than that.

*edit*
besides, I believe this cartridge has been in there for about 4 years now. Granted, it hasn't done much printing since I got ahold of it, but in its office setting, it was printing all day. it's probably just time to replace the cartridge.