There are several causes of Mac startup problems. A lot of us work from home and have heaps of chargers and cables. Check to see that your charger is delivering power. Also, make sure your power socket and extension lead work with other devices. If all else fails, try replacing your power supply. If the problem persists, follow these steps. Using a reputable Mac repair service is a good idea.
Resetting the System Management Controller
If you’ve encountered a Mac PC that won’t start, you may want to reset the SMC. The SMC is responsible for many of the computer’s functions, including power, sleep, wake, idle, and system resets. Performing an SMC reset will not reset the PRAM. However, the reset should fix the problem and your PC should begin to boot up again.
The SMC is a circuit embedded in your Mac that holds all the crucial settings for hardware. When this controller becomes corrupt or confused, the computer will slow down or shut down completely. You can perform an SMC reset by force-quitting any running applications, restarting the device, or restoring the default settings. However, if the SMC reset fails to resolve your problem, you should consult with a professional computer repair service.
Another method is to use the command line and re-enable NVRAM. You can use the Terminal or the Command Prompt to do this. This method is not recommended for novice users. If the problem persists, you may need to reset the System Management Controller (SMC) again. To do this, you should turn off the computer and wait for the second startup sound. Resetting the SMC will enable you to make changes to the hardware and software settings.
Booting from Recovery HD partition
If your Mac has stopped booting into recovery mode, it may be a result of a problem with your startup disk or NVRAM. If this is the case, you can boot from another bootable disk such as an OS X Install DVD. First, make sure that the disk is bootable. Alternatively, you can boot your Mac from the recovery HD partition by holding down the option key when starting it up.
The Recovery partition is a special partition on all Macs. This partition boots independently of macOS and gives you access to a set of repair tools. These tools can be used to repair the hard drive or SSD. You should create a backup before attempting this method. If all else fails, try erasing the volume and restoring it later. However, be aware of the risk that erasing the volume will wipe out all your important files.
Unless you have a backup of the entire system, you can try booting from the Recovery partition. Recovery partitions were created in 2011, and Mac computers that do not have one will always be older versions of the operating system, including Snow Leopard. If you can’t find the recovery partition, you can also recreate the original bootable disc with a bootable installer. This will allow you to upgrade to the latest macOS version.
Resetting the PRAM/NVRAM
If your Mac is refusing to start, you can reset the memory using one of two methods: the PRAM or the NVRAM. While the former is easier to perform, the latter requires some knowledge of the Mac operating system and isn’t necessary for the average consumer. Here are the details of both methods. Resetting the PRAM/NVRAM will restore the computer’s hardware settings to their default configuration and may be necessary for certain problems.
To reset the NVRAM or PRAM on a Mac PC that wont boot, use the Terminal command. This command will restart the Mac and reset the PRAM. Read Apple’s website for more information on using the terminal. Once the system starts, you should see a gray screen. If this solution didn’t fix the problem, you can try it again.
If you don’t have a wired keyboard, try using the power button. Press and hold the power button for about 10 seconds, then release the button. Your Mac should restart now. If this method doesn’t work, you can also connect the power cord and restart your Mac. You may need to wait for five seconds after reconnecting the power cord. Otherwise, you may have to replace the battery.