Older Mac computers store similar information in PRAM (Parameter RAM) instead of NVRAM. For example, if your Mac starts up from a disk other than the one selected in Startup Disk preferences, or a question mark icon briefly appears before your Mac starts up, you might need to reset NVRAM. If you experience issues related to these settings or others, resetting NVRAM might help. The settings stored in NVRAM depend on your Mac and the devices you're using with your Mac. Settings that can be stored in NVRAM include sound volume, display resolution, startup-disk selection, time zone, and recent kernel panic information. NVRAM (nonvolatile random-access memory) is a small amount of memory that your Mac uses to store certain settings and access them quickly. If you experience issues related to settings stored in NVRAM, resetting NVRAM might help. These symptoms could be caused by a hardware issue in your Mac.įollowing the instructions below will reset the hardware and flush the NVRAM/PRAM.

Apple computers may show issues of being slow, freezing or constantly showing a beach-ball icon.

My imac keeps freezing