Accidentally, I wiped out the start up system files.. How can I start up my Mac HD?

Accidentally, I wiped out the start up system files in my Macbook
Air.. How can I start up my Mac HD?

Reboot your computer. Hold down the option key when you hear the chime sound. Go to the recovery partition. Re-install the operating system. It's easy and doesn't take that long (15 to 30 minutes depending on your computer). By default it does an archive and install meaning that you won't lose your files, just read the screen carefully and you'll be fine. It's not a big deal.

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