[Phattony]

I have a G4 power Mac that has a tendency to make a somewhat loud buzzing noise after an 1 hour and a half to 2 hours of operation. The noise seems to be coming from the fan area on the rear of the tower. So far, it hasn't caused any problems, but I want to get this fixed before it does. Anyone have any idea of what this problem is? Any help is appreciated.

[MORT A POTTY]

specific model would be helpful.

[Phattony]

I'm not sure, it's a dual processor G4.

[MORT A POTTY]

what speed?

[Phattony]

I'm not sure. Is there anywhere on the computer that I can find that information?

[wulf]

Originally posted by Phattony:
I'm not sure. Is there anywhere on the computer that I can find that information?

Click on the Apple menu (blue Apple logo at top-right of screen) and select "About This Mac". A box will open, displaying your system version, processor speed (and whether single or dual) and amount of RAM.

Clicking on the "More Info…" button will open the Apple System Profiler, which gives more detailed info about your system.

[SpaceMonkey]

It sounds like the fan in your tower's power supply is going bad and losing its bearings. If there's still airflow coming out of that exhaust area, then there isn't any immediate danger of overheating. If this is the problem, then your only options are to replace the entire power supply or replace the actual fan. Both a new power supply and paying someone to replace the fan inside will be fairly expensive ($200 for a power supply), so your best option is to replace the fan yourself. If you aren't comfortable with opening up the power supply (I'm not), I would see if anyone you know is experienced in this kind of thing and ask if they'll do it as a favor.