Step 2: Press the Option + Command + P + R keys simultaneously. Note: This will reset any customized settings that you may have, so a little re-tweaking may be required after logging back in. If that happens, unplug all other accessories, make sure your keyboard doesn’t need new batteries, and try again. This can happen due to a problem with your keyboard, and other attached devices. You may get a lingering gray screen as if your Mac isn’t sure what to do while you’re pressing the keys. Keep in mind, however, that this doesn’t always immediately work. If you’re experiencing issues, both can be reset to eliminate any possible problems. It has the same function, only it’s based on Flash memory technology, thus a battery isn’t required to keep data intact while the Mac is powered off. NVRAM is short for Non-Volatile Random Access Memory. It’s similar to the CMOS used on Windows-based PCs, requiring a battery to keep the settings intact while the Mac is powered off. It’s a type of memory that stores system settings in Macs, like the display resolution, the time zone, speaker volume, and so on. PRAM is short for Parameter Random Access Memory. Also, back up your data before you begin. Make sure you try basic rebooting and other troubleshooting first. Note: Resetting the PRAM and SMC is usually safe, but it’s not a guaranteed fix. Below, we’ll show you exactly how it’s done. When this happens, you can often set things right by returning them to their factory defaults. Sometimes these settings can get confused or tied in knots due to a variety of causes.
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