the SMC firmware on a MacPro? Or is there some other way to fix a fan speed problem which was introduced by updating the firmware?
I have an old (2,1) MacPro running 10.7.4 which was having some problems with failing to reboot, not responding to the power button, etc. Following instructions on Apple's support site, I updated the SMC firmware and reset the SMC, which did correct that problem -- however it introduced a much worse problem in that now the fans run at full howling speed whenever the machine is under even the slightest amount of load (watching a youtube video is enough to trigger it.) The fans run at normal speed while I'm in bootcamp windows; it's only a problem while booted into OSX.
Mountain Lion is apparently not supported on this hardware, and I'm on the latest version of Lion. The machine has the current versions of SMC and EFI for its model as shown on this page
; later versions of the firmware refuse to install on this hardware (it was probably very unwise of me even to try.)
Ideally I'd like to revert the firmware to its original factory version -- I can live with the reboot problems, not so much with the fullspeed fan noise; seriously it sounds like a shuttle launch up in here. Is this possible? Or am I screwed?
(I am aware of the FanControl and smcFanControl extensions; both allow you to increase the minimum fan speed, they do not allow you to limit the maximum fan speed.)