Changing computer name issue

Hello, it's dangerous, but can be done...

For Mac OS X v10.4.11 and earlier

1. Optional step: As a precaution, you may disable automatic login prior to performing this procedure. You might want to back up important data, too. In the event that you restart the computer for any reason before completing the procedure, this would prevent complications from having displaced the user selected for automatic login. (For Mac OS X v10.1.5 or earlier, automatic login is found in the Login preference pane. For Mac OS X v10.2 and v10.3, it is found in the Accounts preference pane.)
2. Mac OS X v10.3 or later: If FileVault is enabled, temporarily turn it off, which will log you out.
3. Enable the root user and log in as root.
4. For Mac OS X v10.2 or later: Open the Accounts pane of System Preferences.
   For Mac OS X v10.1.5 or earlier: Open the Users pane of System Preferences.
5. In the Name list, locate the user account with the short name that you want to replace. This will be referred to as the "original user".
6. Note whether or not the original user is identified as an administrator, which appears in the Kind column to the right.
7. Click New User. For Mac OS X v10.3 or later, this is the plus ➕ button.
8. Complete the Name and Short Name fields as desired. Be sure that the Short Name is exactly as you want it to appear.
9. For Mac OS X v10.2: Fill in the New Password and Verify fields.
   For Mac OS X v10.1.5. or earlier: Click the password tab, then fill in the Password and Verify fields.
10. If the user you are replacing is an Admin user, then select the checkbox for "Allow user to administer this computer". For Mac OS X 10.3, click the Security tab to locate this setting.
    Note: This checkbox is dimmed and already selected if there is not another Admin user. Mac OS X requires at least one Admin user.

http://support.apple.com/kb/HT1428

Good work asking, great news, thanks! 🙂

An easier way to do it is to open your terminal, chang to root user (sudo -s), then enter the command "scutil --set HostName TheHostNameYouWant" and that's all, easier and faster.

Best regards.