It is possible that the information in the NetInfo database about a NetBoot client becomes unusable. If this happens, deleting the client's entry in NetInfo allows the default information to be restored when the client starts up again. Deleting these NetInfo entries does not result in loss of user data, and the entries are automatically restored when the client starts up again.
Please read article 60038: "
What is NetInfo?" for instructions on backing up the NetInfo database before continuing.
To delete the NetBoot entries, log in as root or as a member of the wheel group.
1. Open NetInfoManager by choosing Server Administration from the Apple Menu, then choosing NetInfoManager from the submenu (/System/Administration/NetInfoManager).
2. In the Directory Browser, select the /machines directory.
3. Highlight the name of the NetBoot client that is not starting up from the NetBoot server.
4. Choose Delete from the Edit menu, or click the Trash button in the NetInfoManager window.
5. Save changes. Note: After saving changes, the MacNC id for the client that is not starting up from the NetBoot server is unused. This MacNC id will be reassigned to the next NetBoot client that has not already started up from the NetBoot server.
6. After you have confirmed the changes in Netinfo, restart the client in question.