AudioIPCDriver.kext ERROR

Question

Hello,
Every time I keep starting up my PowerBook G4 with 10.4.11, I keep getting any error msg with AudioIPCDriver.kext stated below;
"System extension cannot be used.
The system extension "/System/Library/Extensions/AudioIPCDriver.kext"
was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update."
I read a couple of threads most of which that refer to this;
1. Open a Terminal (Usualy in Applications -> Utilities -> Terminal.app)
2. Go to the extensions folder from the terminal with the following command:
cd /System/Library/Extensions
3. Manually change the extension rights with this command:
sudo chmod -R 755 AudioIPCDriver.kext
However when I type this into Terminal, "sudo chmod -R 755 AudioIPCDriver.kext"
I get this in Terminal;
"WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort."
I type in the password and get this message in Terminal;
"chmod: AudioIPCDriver.kext: No such file or directory"
Can someone send me any suggestions?
Thanks!

Answer 1

several things:
First, your directory path needs to be preceded by a /
i.e.,
cd /System/Library/Extensions
Then you need to realize that root user is not enabled by default, so you need instead to issue
sudo chmod -R 755 filename
or else start a root shell like this:
sudo /bin/bash
or whatever shell you need.
These are fairly elementary things, so I apologize if I am overstepping, but make sure you really understand what you are doing before tampering with anything in /System