If you dont see the volume you want to use, wait a few moments for Startup Manager to finish scanning connected drives.You can also attach FireWire or USB external hard drives that contain an operating system to add to the list of startup volumes.Volumes that dont contain a valid operating system arent listed in Startup Disk or Startup Manager.
Cant Access System Preferences On Boot Install OS XIf the volume contains OS X, start your computer from OS X Recovery and use Disk Utility to repair the volume, or reinstall OS X on the volume using the Recovery System.
Cant Access System Preferences On Boot Mac From ThePress Command-R during startup to start your Mac from the Recovery System. For instance, to allow everyone to access the Time Machine preference pane, the three commands would be changed to. And believe it or not, that may be a valid solution to the problem, depending on the competence and trustworthiness of your users. But if youre inclined to use the standard, managed, and administrator user models to ensure a bit tighter security, then this tip can help you keep your personal workload low, while allowing other users to perform routine tasks, such as resetting printers, without needing the local overlord to make an appearance. The Macs administrator account isnt an all-powerful tyrant; it has a number of restrictions, including the inability to access another users data. It does, however, have power over all of the Macs system preferences, including the ability to add new apps, add new users, assign user groups, manage parental controls, set up accessibility options, and manage printers. You get the idea. If theres a system preference pane for a service, users holding an administrator account can make changes as they see fit. So, standard users can pick their own desktop wallpaper, customize the Dock, and set their own preference for how a mouse or track pad works. They cant add or delete users, or change settings that would affect anyone else. With Parental Controls, you can restrict the apps available, the websites that can be visited, and the contacts available to the user through various apps, such as Messages and Mail. ![]() It doesnt allow general access to the Mac, or the ability to change any settings. All of a guest users data stored on the Mac is deleted automatically when the user signs out. In general, this is a good idea; having a single administrator can cause problems if the administrator isnt available when some task comes up that needs the admin password. In this example, you can change a standard user to an administrator. This is the way we fixed one of our headaches: clearing printer jams that cause the print server to pause. By giving all standard users admin rights to the Printer preference pane and print server, they can be their own printer administrator. In this example, were going to raise the privilege levels of every user (except the guest account) to manage the printer system. This same technique can be used for any of the preference panes listed above. It makes use of the authorization database that Apple introduced with Mavericks. This database is used to control the access rights for many different processes, such as printing, Time Machine, and networking. Youll need to be logged in with your administrator account to make these changes. This means youll need to execute three Terminal commands for each preference pane to which you wish to give non-admin access. Errors in making changes to the database can produce unexpected results; a current backup will let you recover to a known good state. ![]() After each line is entered, hit Return or Enter on your keyboard.
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