Does resetting PRAM / NVRAM work on all Macs? You can then let your Mac boot up as usual. The PRAM has been reset only if you hear the Mac reboot sound a total of two times – once for the initial reboot and again when the PRAM has been reset (technically you can keep holding down the key combo and reboot the Mac over and over, but there is no practical reason to do so).
How do you know the PRAM / NVRAM is reset? This works to reset the PRAM and NVRAM on every Mac hardware. You must hit the key combination before the grey screen appears otherwise it won’t work, you may need to try it once or twice until you get the timing right during restart, but once it works you can let the Mac system start as usual. You will then hear the Mac reboot sound again, signifying that the Macs PRAM or NVRAM has been reset successfully. Reboot a Mac and then immediately hold down the Command+Option+P+R keys.You reset the PRAM / NVRAM by doing the following:
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