HT201262: Try safe mode if your Mac doesn't finish starting up
Learn about Try safe mode if your Mac doesn't finish starting up
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Helpful answers
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Nov 6, 2015 6:23 AM in response to jamrobsrby Acm001,What version of os x are you trying to install? Is the disc original to the macbook?
Restart your Mac while holding down the mouse or trackpad button. You may think it’s not working, but keep holding the button down until your computer has fully restarted. This has always been my last resort and has never failed to work for me.
However, if it didn’t work for you, restart while holding the Option key to open up the Startup Manager. When you get your selection of bootable volumes, let go of the Option key and press the eject button. This should pop the disc right out, too.