If one day you woke up but your Mac didn’t, it might feel like your life has stopped when you think about all the lost in-progress work, photos, documents, etc. Don’t worry — all you need to do is methodically follow a series of steps to bring your machine back to life.
There might be a time when you think that your Mac is not the same as it used to be and you probably want to queue a Mac reinstall OS process to start anew. To do that, you need to launch the Mac Recovery Mode.