Apple silicon Macs reset it automatically. This combination resets NVRAM. Note that it will work for Intel-based Macs only. When you hear a sound and see the screen flash, release the keys and let your Mac boot up as usual. Reboot USB drives by shutting down your system and restarting it, holding Command+Option+P+R as you do.Reboot your Mac - a simple on and off is sometimes all it takes.Test the hard drive on a PC - it could be formatted for PCs and not readable on Macs.Try the drive in another Mac - if it works there, the problem is with the USB ports on your Mac.Try connecting the hard drive to a different USB port - it could be a hardware issue.
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