Hi, I edited a version of the MacBook Pro's fan control to work on Mac Pros: http://forums.macrumors.com/showthread.php?p=14711253&posted=1#post14711253 However, it needs to restart into 32-bit mode to work. What is involved in converting it to 64-bit mode? This is my base code: http://www.firewalldesign.com/sderman/Misc/ExtendedMB+MBproFanControl1.2.dmg (The code is on another mac, hence why I haven't posted that). Ideas? Cheers!