I have a Macbook Pro 2012-2013. HDD crashed (Bad sectors). Replaced HDD. attempting to Load Sierra via USB, no go. Read to go back and install Yosemite. Press Options Command +R. To boot from USB. Load stopped at 50%. Let sit for a few days. Read that I should reboot and press Command R for Recovery. It went through the Loading from internet Recovery, went dark then to a Greyish screen where it still sits. Any ideas fellows?
