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Mini vmac system startup extension1/27/2024 ![]() Non-volatile RAM (NVRAM) or parameter RAM (PRAM) stores information while your Mac is off. Tim Brookes / How-To Geek Command+Option+P+R: Reset NVRAM/PRAM You can also launch Apple Diagnostics from the internet by holding Option+D at startup, which is handy if you can’t get online. Run Apple Diagnostics to check your Mac for known issues, then cross-reference any error codes you get with Apple Support. This includes USB drives that are plugged in while your computer starts up, Windows partitions created with Boot Camp, or additional macOS installs that are stored on external drives. If you want to boot from a different partition or volume then hold Option while your Mac boots to see a list of eligible boot disks. This allows you to do things like reinstall macOS, access Disk Utility to attempt to repair any drives, execute commands using the Terminal, or restore from a Time Machine backup. To access Recovery Mode, press and hold Command+R while your Mac boots. In the Utilities section are a few more useful tools:
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