Repair Disk Permissions.
Macintosh HD>Applications>Utilities>Disk Utility.
Select the drive and click on Repair Permissions.
Reboot.
I just tried that no luck but I will try one more time just incase 🙂
If the G5 fans are not blasting any your heat is in a normal range (for your Mac) then I'd say yes. It would indicate that the fans are still being controlled by the OS.
Not sure exactly what this kext does although the name certainly indicates something to do with fan control. But perhaps it's for a laptop. IDK.
+S while booting). When the command prompt appears, type /sbin/fsck -fy . You will get a series of read-outs. At the end of them, you will either see "THE FILE SYSTEM WAS MODIFIED" or "The file system is okay."(these may not be the exact phrases, but something similar. The permissions for the kext are not set correctly. Running permissions repair won't work in this case as the faulty kext just gets ignored.
Open a Terminal window and try the following, assuming your kext is in /System/Library/Extensions as per the error message
sudo chmod -R 755 /System/Library/Extensions/AppleFan.kext
sudo chown -R root:wheel /System/Library/Extensions/AppleFan.kext
As far as I can remember, Leopard should rebuild the kext caches on reboot, otherwise you may need to remove these and then reboot again to force a rebuild.