When you hear the second start-up tone (or, on a Mac Pro, see a second Apple logo appear and disappear), you can release the keys and let the computer finish its start-up sequence. You can reset the NVRAM or PRAM by shutting down the Mac and then starting it up again while holding down the Option, Command, P and R keys all at once. These advanced steps are primarily for system administrators and other experienced users who are familiar with entering commands in Terminal. If the Mac is not maintaining its settings for volume level, display resolution, time-zone information or preferred start-up disk, information held in the NVRAM may have become corrupt. Create a bootable installer for macOS You can use an external drive or secondary volume as a startup disk from which to install the Mac operating system. Otherwise, try holding down the Control (Ctrl) key. Press it now to turn on your laptop, and you will hear the pleasant startup BookI. Modern Macs also store some settings in an area of the system called the nonvolatile random access memory (NVRAM) older Macs use parameter random-access memory (PRAM) in a similar manner. If the OS is frozen but the mouse cursor still responds, click the Apple ( ) symbol in the upper left corner of the screen and select Restart. After your new MacBook is resting comfortably in its assigned spot (a. might fix erratic Mac behavior, although it will not help with a damaged power supply or another major hardware problem. Blank (empty) screen Learn what to do if your Mac starts up to a blank screen, such as an empty gray, black, or blue screen. (You may also have to redo any preferences for your display and power-management settings.) While performing a reset does not generate an alert box or notification, you can tell if you were successful if the odd Mac behavior stops. The guide also lists a series of things you should try before resetting the S.M.C. reset process for all its Intel-based Macs, including those with removable batteries and desktop models. When the new owner starts up the Mac, they can use their own information to complete the setup process.Apple’s support site has a full guide to the S.M.C. If you’re selling, trading in or giving away your Mac, press Command-Q to exit the setup assistant without completing the setup process, then click Shut Down. Use the Disk Utility app on your Mac to repair your startup disk. Check your login items to learn if any of them are incompatible. ![]() When the installation is complete, your Mac may restart to a setup assistant. If your Mac successfully starts up in safe mode, choose Apple menu > Restart to restart your Mac normally. Your Mac may restart and show a progress bar several times, and the screen may be empty for minutes at a time.
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