Console message and system.log

Question

Hi,
in the console system.log always apear this message every 30 second:
+Feb 16 02:22:55 Macintosh SystemUIServer[346]: Error: ACInterfaceGetPower() called with invalid interface+
+Feb 16 02:23:25: --- last message repeated 5 times ---+
and every 5 second this other message:
16/02/08 02:40:55 SystemUIServer[346] Error: ACInterfaceGetPower() called with invalid interface
.. and the message look like an infinite loop message.
Is it a problem ?
And i can ear the Internal HD run always.
Thanks on advice for any help
Ale

Answer 1

I just went through a bunch of research on this on my own iMac G5. (BTW - do you have an iMac G5 or an iMac Intel Core Duo? It can't be both)
It comes down to the items that the SystemUIServer is trying to call. if you look at <homefolder>/Library/Preferences/com.apple.systemuiserver.plist and open it with TextEdit, you'll see that, among other things, it references 8 menuExtras -
Battery.menu
Displays.menu
TimeMachine.menu
Bluetooth.menu
AirPort.menu
Volume.menu
Clock.menu
User.menu
While logged in as an administrative user, I launched System Preferences, Activity Monitor, and the Console looking at *+All Messages+*. I got the same ACInterfaceGetPower() error every 5 seconds, too. So I went through the Preferences and deactivated each menu item above, but the messages continued to appear.
I had two items that might have been causing a problem. The first was the fact that I had the AirPort signal showing up in the menu bar, even though the Network location I have set up does not have AirPort as an available service. I added the Airport service back in, disabled the menu icon, removed the AirPort service again, and Applied the changes. I'm pretty sure the error message was still appearing at this point.
The big change came when I opened up Accounts. First, I went to the Login Items section for my current user. I noticed that the EyeTV Helper and an Adobe process were both there along with the iTunes Helper process. I removed the first two using the "-" at the bottom. That actually appeared to fix it, but I proceeded to the Login Options section and disabled *Fast User Switching*. That removes the users from the menu bar. By this time the only thing left in the menu bar was the Spotlight icon.
Switching over to Activity Monitor, I killed the SystemUIServer process. It restarted and the ACInterfaceGetPower() messages did not reappear. I then re-activated each item, one at a time, killing the SystemUiServer after each activation. Again, the messages did not appear. I did not re-activate Bluetooth or AirPort, since I do not need them.
I am no longer getting those messages and the system appears to be running fine right now.
I have an external monitor attached to the iMac G5 as well as 4 FireWire hard drives. I am connected to the outside world via FiOS and I have a 100 Mb CAT-5 connection to that router.