If the values in this memory got out of whack for one reason or another, your Mac might not start up correctly, or might exhibit any of numerous odd behaviors afterward. Your repair repertoire should also include a couple of additional procedures that can occasionally eliminate otherwise inscrutable problems-zapping the NVRAM and resetting the SMC.īack in the day, the standard list of quick fixes for random Mac ailments always included “zap the PRAM.” The P in PRAM stood for parameter (the RAM was just RAM-random access memory), and it referred to a small amount of special, battery-backed memory in every Mac that stored information the computer needed before it loaded the operating system. When your Mac starts acting up, you’ll probably run through some common troubleshooting procedures, such as restarting it, running Disk Utility, and perhaps performing a Safe Boot. When replacing the hard-drive you need to reset the firmware settings to recognize the new hardware.
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