A small amount of your computer’s memory, called “non-volatile random-access memory” or NVRAM, stores certain settings in a location that OS X can access quickly. The settings that are stored in NVRAM depend on the type of Mac you're using, and the types of devices connected to it. Information stored in NVRAM include speaker volume, screen resolution, startup disk selection … [Read more...] about How to Reset NVRAM on a Mac
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