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Since I stay on top of possible hardware errors using utilities, I don't want to allow my Mac to boot up and go through the checks each time. How do I skip over this process each time the computer boots by using Terminal commands, and then how do I reinstate the default startup routines if I want to have a traditional boot?

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    The POST process takes mere seconds, and can identify problems that can have serious ramifications with disastrous complications. – IconDaemon Dec 5 '19 at 17:35
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    How often do you shut down and start up, and/or reboot? I go for weeks, probably months, between reboots. I only reboot when there's an unrecoverable error, which is probably once or twice a year. – shoover Dec 5 '19 at 23:47
  • You're also assuming Jan that there's not been an issue since you last checked and your mac booting up, that's why you have the POST checks. – Ryan McDonough Dec 6 '19 at 9:44
  • My Macbook only boots when there is a kernel update or something has gone very wrong. Both are quite seldom. – Thorbjørn Ravn Andersen Dec 6 '19 at 13:37
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You can’t bypass this.

It’s technically not an Apple limitation as all computers (PCs too) need to run a minimal set of tests to probe how much RAM is available, what boot devices are present, etc. Without it, your Mac wouldn’t know from where to boot from at a very minimum

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There is no official way to disable hardware checks when your Mac boots up.

These hardware tests are collectively referred to as the Power On Self-Test (POST) stage. These checks are considered critical to safely and securely booting the operating system.

Boot Arguments

You can learn more about the available boot time options through the links below:

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