NOTE A knowledge of bash and the command-line (in general) is recommended. Verbose mode exits automatically when your mac finishes booting. It will contain information important to startup, allowing you to diagnose startup problems by seeing any errors that may be occurring during startup. A terminal-like interface will appear while booting. Very similar to Windows Safe Mode a great way to troubleshoot OSX applications and extensions that aren't working properly. (Allows you to transfer files to and from your machine with. puts your Mac into Target Disk Mode, effectively turning your computer into a large removable flash drive.You can alternatively use the Alt+ N keys during startup to start from a NetBoot server using the default boot image provided. if your setup includes a compatible network server (NetBoot), you can hold down the said key during boot to attempt a network boot.May also allow you to boot to a USB, but that's just a conjecture. This will load the boot menu allowing you to boot to a different operating system partition you may have installed on your hard drive.Hold the keys down until your computer restarts: release the keys after you hear the second startup sound. Clears the PRAM (parameter RAM) and NVRAM (non-volatile RAM): if either the PRAM or the NVRAM become corrupt, problems will ensue.Hold down Alt+ Cmd+ P+ R during startup.Option+ D can be used instead to try starting up Apple Hardware Test or Apple Diagnostics over the internet.Takes you to Apple's Hardware Test utility (or Apple Diagnostics, depending on Mac model).Mac OS X boot-time keyboard shortcuts (in no particular order): In addition, be sure to run and check the output of sudo dmesg | less: in my experience, if your system is experiencing problems, there's a high likelihood that dmesg's output will shed light on the situation. see man page for more details: man memtesterĪlso, while this may sound super silly, I'd invest some time in checking the contents of your systems' logs, like tail /var/log/system.log, however, if I were you I'd check everything in /var/log just to make sure that you aren't missing anything.install via brew: brew install memtester.Based on the previously mentioned memtest86.So you're on your own.Ĭheck out for other applications of a diagnostic/forensic nature I couldn't find much in the App Store with a few quick searches, but I do know of a couple different RAM diagnostic utilities, however, all of them require the use of a USB or a floppy or some other media type that can be booted into while I have experience with at least one of these, I have never used any of these under Mac OS X.
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