Mac restarting to prohibited symbol after SSD upgrade
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I upgraded the 320gb hard drive in my mid 2010 MacBook Pro to a 1TB WD Blue SSD and it works great, except for one problem. When I click restart from within macOS, the laptop shows the Apple logo for about 2/3 of the loading bar and then changes to a prohibited symbol. It boots just fine from a shutdown and works reliably. The MacBook is running macOS High Sierra, so it’s not a version that it can’t support.