9/3/2023 0 Comments Techtool pro 11![]() ![]() This is best performed after shutting your Mac down, rather than after a restart, and requires any firmware password to be turned off first. If you hold the keys too long, the Mac cycles through a second reset if you don’t hold them long enough, the reset won’t be performed. Hold the Command, Option, P and R keys until the startup chime sounds a second time, until the display light comes on a second time, or until the Apple logo appears and disappears for the second time. Resetting the Non-Volatile RAM (NVRAM, formerly known as PRAM) can fix some other problems, and is normally performed after resetting the SMC. Full details for doing this are given here. Resetting the System Management Controller (SMC, a function also performed by the T2 chip in recent models) can fix various problems, such as difficulty sleeping or waking from sleep, cooling fans stuck on, and more. However, it can occasionally give immediate insight into startup problems. On most models, this now scrolls past so quickly that it’s better to browse the log after startup is complete using a utility like Consolation. Hold the Command and V keys during startup to see scrolling log information about that startup as it proceeds. You want to see details of the startup process: Verbose Mode When you have selected one, startup will proceed from that volume. Hold the Option key during startup to display a list of different volumes which you can choose to start up from. You want to select which startup volume to boot from: Startup Manager This article provides full details of Safe Mode in Catalina, and additional information is here. Hold the Shift key during startup to enter Safe Mode. However, the checks on snapshots in High Sierra and Mojave can take a very long time, and it isn’t a useful way of checking your startup volume, which is much better performed using Disk Utility in Recovery Mode. This can clear some strange problems, and is a valuable tool for diagnosing problems with third-party extensions, etc. It also flushes and rebuilds user caches and OpenDirectory databases. It disables a long list of Apple’s kernel extensions, and doesn’t load any third-party extensions or daemons. It checks your disks and all snapshots, which can take 30 minutes or more, and may automatically make necessary repairs, but doesn’t report the results, and skips this entirely in Catalina. This does three things: in Mojave and earlier. You want to flush user caches and disable third-party extensions, etc.: Safe Mode Hold the Command and R keys (with/without Option and Shift according to the variant required) during startup to enter Recovery Mode.Ī guide to the different variations of Recovery Mode is here. Although you can’t add your own tools to this list, when in Recovery Mode you can mount your normal startup volume and access tools on it using Terminal. The tools include Disk Utility, macOS Installer, Restore from Time Machine Backup, Terminal, Network Utility, Firmware Password Utility, and Startup Security Utility. This starts the Mac up from its normally unmounted Recovery Volume, providing a suite of tools to tackle these and other tasks. You want to check and repair your startup disk, reinstall macOS, restore from a backup, change firmware password or Secure Boot settings: Recovery Mode Hold the D key during startup to engage Diagnostic Mode. This is best performed after shutting down, rather than restarting. You’ll also need to disable any firmware password first, and put a MacBook Pro, MacBook Air or MacBook onto mains power before starting. To perform this reliably, disconnect all peripherals except the keyboard, mouse/trackpad, any external display, and any Ethernet network cable. Have a pen(cil) and paper handy, as it returns a code which you’ll need to record. On all models released since June 2013, this goes straight into a dedicated tool which performs basic hardware diagnostics. You want to check that your hardware is OK: Diagnostic Mode There’s nothing more frustrating than trying to start up in Recovery Mode, say, and finding your Mac ignores you completely. Although many Macs will start up in special modes using Bluetooth alone, this has become increasingly unreliable. This short guide explains which does what, how to start up in that mode, and a link to a fuller account.īefore trying to start up or restart in any except for normal user mode, it’s best to connect your keyboard (and mouse/trackpad) using a USB connection to your Mac, such as the charging cable for wireless models. Macs have different modes in which they can start up.
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