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Introduction
When your Mac starts acting strangely—the screen resolution is wrong, the volume doesn’t work, or the startup disk selection seems forgotten—a reset NVRAM Mac procedure can often fix these problems. NVRAM (non‑volatile random‑access memory) is a small amount of memory that stores specific settings your Mac needs before loading macOS. When that memory becomes corrupted, odd behavior follows.
An NVRAM reset clears those stored settings and restores them to defaults. It takes less than a minute and doesn’t delete any of your files or applications. For an overview of all the different types of Mac resets, see our how to reset a Mac guide . If your issue involves power, battery, or fan behavior, you may actually need to reset the SMC rather than NVRAM—our SMC reset guide covers that separate process.
What NVRAM Controls
NVRAM (previously called PRAM on older Macs) stores several low‑level settings that your Mac references during startup. These include:
- Screen resolution and display refresh rate
- Startup disk selection
- Speaker volume and sound output settings
- Time zone information
- Recent kernel panic information (if applicable)
When these settings become corrupted—either by a software glitch, a failed update, or an unexpected shutdown—the symptoms are specific and noticeable. Your screen resolution might default to a low, stretched appearance. The startup disk you usually boot from might not appear. Sound might be muted or stuck at a particular level.
It’s important to understand that an NVRAM reset only affects these startup‑related settings. It does not touch your personal files, applications, user account passwords, or any data stored on your drive. It is entirely safe to perform and takes less than a minute.
For broader issues that affect the entire system—such as sluggish performance, frequent freezes, or applications that refuse to open—a standard restart or Safe Mode boot is usually the better first step. Our how to restart a Mac guide covers all of those methods.
How to Reset NVRAM on an Intel Mac
The key combination for Intel Macs is Command + Option + P + R. Follow these steps exactly:
- Shut down your Mac completely. Don’t just restart—choose Shut Down from the Apple menu and wait for the computer to power off entirely.
- Press the Power button to turn your Mac back on.
- Immediately, before the Apple logo appears, press and hold Command + Option + P + R all at once.
- Keep holding these four keys. Your Mac will restart during this process—the screen may go dark and then light up again.
- Continue holding for about 20 seconds, or until you hear the startup chime a second time. On Macs without a startup chime, watch for the Apple logo to appear, disappear, and then appear a second time.
- Release the keys and let your Mac boot normally.
After the reset, check your settings. Some preferences—like startup disk selection and speaker volume—may have reverted to defaults. Head into System Settings to reconfigure them to your liking.
What About Apple Silicon Macs?
If you own a Mac with an M1, M2, M3, or M4 chip, you do not need to manually reset NVRAM. Apple Silicon Macs automatically check NVRAM during every startup and reset it if necessary. The manual key combination used on Intel Macs does not work on Apple Silicon. If you experience display, volume, or startup disk issues on an Apple Silicon Mac, a standard restart is usually sufficient. For persistent problems, boot into Safe Mode or use Disk Utility to run First Aid on your startup disk.
When to Use an NVRAM Reset
Try an NVRAM reset when you see these specific symptoms:
- Screen resolution appears incorrect or won’t change
- Startup disk is not recognized or default boot disk keeps changing
- Sound volume is stuck, muted, or behaves erratically
- System clock resets to an incorrect time zone repeatedly
If these symptoms don’t match your issue, the problem likely lies elsewhere. Kernel panics or repeated crashes often suggest software or hardware faults beyond an NVRAM reset. In those cases, start with a normal restart or Safe Mode boot, as covered in our how to restart a Mac guide .
Frequently Asked Questions
Will resetting NVRAM delete my files?
No. It only clears low‑level settings. Your documents, photos, and applications remain untouched.
How often should I reset NVRAM?
Only when you experience the specific symptoms listed above. There is no benefit to doing it regularly as maintenance.
Does an NVRAM reset work on Apple Silicon?
No. Apple Silicon Macs manage NVRAM automatically. The manual key combination only works on Intel Macs.
What if the NVRAM reset doesn’t fix the problem?
The issue may be related to the SMC. Try resetting that next. Our SMC reset guide explains the steps for every Intel Mac model.
