hum noise, what to do?
I have recently bought a used mac pro 4.1, it makes weird hum noise which is coming from bottom of the mac pro and I guess the noise is produced by the exhaust fan. Which does annoy me. How do I get rid of this noise? changing rpm did not help. Consequently, how do I change the Exhaust fan?
Also, it produces buzz noise which is coming from the AC what should I do also? Help is required.