The 'fan' connector supplies 12v DC; I don't know the polarity off hand.
You'd probably be batter off using an external fan, since an internal one off
the fan connector can increase the stress on the power supply and cause noise
in the audio circuitry.
--
Ian Schmidt: irsman@iastate.edu or aol.com, BITNET: twbv4@isuvax
"I will choose a path that's clear: I will choose free will." - Neil Peart