Mac Pro Fan making lots of noise since last update

You might want to reset the SMC and PRAM....

No I never had any problems with my fans. The reset button is on the main board just above the RAM boards. Your owner's manual should explain how to do the reset and also how to reset PRAM...

I am having the same problem, have you found a solution?

1 or 2 days after receiving my brand new Mac Pro last august, it tried to imitate a jetplane taking off. I tried every possible reset of the PRAM and the SMC, but to no avail…
I contacted Apple Sales Support, and had the pleasure of unpacking another brand new Mac a week or so later. (needed shipping from Ireland)

If you have done an SCM and PRAM reset and you have the latest firmware, etc., there is really little more to try. You can reinstall the OS "from scratch" and see if that "fixes" the problem. But if not, I would suggest contacting the Apple service people to have a look at your computer. I presume it's still under warranty....

I was having the same problem with a little bit older G5 - the whole Jet Engine thing would happen and then sometimes I would get this error that said "You must power off your computer now - and then that is all I could do - force of the computer. A Genius at the local Apple store told me that 3rd party memory can cause that problem. He said it should not be a problem unless it does it a lot and during a time when system files are being written. Since I have been unable to afford Apple memory - I just do a safe boot every time it happens and then it will not happen for a while - especially if I shut it down every few days.

I do not know if this helps anyone - but I thought I would share!

:o)

Juli

The fan is the fourth problem I have had since purchasing my Mac Pro in Oct. of 2006. I started having trouble immediately and to date have had my power supply and both processors replaced. Now I am told I need my logic board replaced.

It is clear that when one component of the machine is malfunctioning, it wears on the other components. I want a replacement. Does anyone know the best way to go about getting this "lemon" replaced?

I bought a MacPro in august of 2006, and I have had the same problem a few times since then, but only every 3-4 months or so. When it happens, it's because I use a CPU intensive app, and the fans start (which is OK), but they never, never stop, even if the computer gets idle for a long time after that. Every time this happens, I have to shutdown completely and power back on to get the fans to stop (a simple "warm" reboot won't do the job).

It happened 2 times in the last 2 days, and I updated my EFI-SMC many days (weeks?) ago ... It is doing it right now, and iStat shows that my temp is 30 degrees C (which is pretty cool), and my hard drive fan is at 499 rpm, exhaust fan is at 599 rpm, CPU fan is at 500 rpm, and power supply fan is at 2778 rpm. This is the one making all that noise.

I would like to know how to calm down this fan when I quit my CPU intensive apps and the temperature gets cooler...

It's a bit annoying.

Thanks all for your input.

I installed a MacPro EFI update that was released yesterday (august 9, 2007). This update contains specific fixes for the MacPro fans. Hopefully, these fans problems will be a thing of the past.

So folks, check out software updates...

I'll try to reproduce the problem by stressing the CPUs in my MacPro and report.

There was an SMC update. The Mac Pro does use an EFI "BIOS" but haven't seen any updates since last September or so.

With Software Update, I would also wait to download until after you have repaired and backed up, then do a fresh restart (even doing a Safe Boot) before applying. And then grab the standalone updates instead.

And maybe not apply multiple firmware updates in one step (for OP).

The fans should respond better to thermal environment, which could, in a warm situation, run higher rpm. Not to 'fix' or quiet the fans.

Running Onyx, Tiger Cache Cleaner, Applejack to clean caches on startup in Single User Mode is often a good idea when updating as well.