How to Reset NVRAM and SMC on a Mac
A complete walkthrough resetting NVRAM and the System Management Controller — two different low-level resets, solving different categories of problems, on both Apple Silicon and Intel Macs.
NVRAM and SMC resets are two genuinely different troubleshooting tools, each addressing a different category of low-level Mac problems — and, since Apple Silicon, the procedures for each have changed significantly from the older Intel-Mac key combinations many longtime Mac users still remember.
Step 1: understand what NVRAM stores, and what resetting it fixes
NVRAM (or PRAM, on very old Macs) is a small amount of memory that persists specific settings across reboots — startup disk selection, display resolution, time zone information, and recent kernel panic data among them. Resetting it is worth trying for: unexpected startup disk selection behavior, display resolution problems appearing right after boot, or sound-related boot issues.
Step 2: reset NVRAM on an Intel Mac
Shut down completely, then power on while immediately holding
Cmd + Option + P + R, keeping the keys held until the Mac
restarts and you hear the startup chime a second time
(or see the Apple logo appear and disappear a second time).Step 3: reset NVRAM on an Apple Silicon Mac
Apple Silicon Macs reset NVRAM-equivalent settings automatically as a normal part of their startup security process — there’s no manual key combination needed or available. If you suspect an NVRAM-equivalent setting is causing a problem on Apple Silicon, a full restart is generally sufficient to reset it.
Step 4: understand what the SMC controls, and what resetting it fixes
The System Management Controller (SMC) — present on Intel Macs — handles low-level hardware functions: battery management, thermal and fan control, power button behavior, and status indicator lights. Resetting it is worth trying for: fans running at unexpectedly high speed with no clear cause, battery not charging correctly, or the Mac not responding to the power button at all.
Step 5: reset the SMC on an Intel Mac with a non-removable battery
Shut down the Mac, then hold Shift + Control + Option (left side)
plus the power button together for 10 seconds, then release
and power on normally.Step 6: reset the SMC on an Intel desktop Mac (Mac mini, iMac, Mac Pro)
Unplug the power cord, wait 15 seconds, plug it back in,
wait 5 more seconds, then power on.Desktop Macs don’t have a battery-relative key combination the way laptops do — the equivalent reset is a full power disconnect instead.
Step 7: understand why Apple Silicon Macs don’t have a separate SMC reset
Apple Silicon integrates the functions the SMC used to handle into the main system-on-chip and its associated controllers, managed automatically without a distinct, separately-resettable component the way Intel Macs had. A full shutdown and restart is the closest equivalent troubleshooting step available on these machines.
Step 8: know when neither reset is actually the right tool
Both resets address a fairly narrow set of specific, low-level symptoms — they aren’t general-purpose “try this for any weird Mac behavior” steps. A boot loop specifically is more directly addressed by the dedicated boot-loop troubleshooting path, which covers NVRAM reset as one step among several rather than as a first-resort fix for every startup problem.
Why the Apple Silicon changes catch longtime Mac users off guard
The Cmd+Option+P+R and SMC key-combination folklore is extremely well-established Mac troubleshooting knowledge, built up over many years of Intel (and pre-Intel) Macs — which is exactly why it’s worth explicitly confirming which architecture a given Mac uses before reaching for a key combination that may no longer apply, rather than assuming decades-old muscle memory still works identically on newer hardware.