Look at the following instruction to reset NVRAM/PRAM on Macbook, Macbook Pro, Macbook Air or iMac.
First let’s learn what are NVRAM and PRAM?
NVRAM stands for Non-volatile random-access memory.
NVRam storages the parmanent information after the OS is turned off. Besides, PRAM saves the temporary data when the OS is operating.
What are saved by PRAM?
- Speaker volume
- Screen resolution
- Startup disk
- Kernel-panic error
- Status of AppleTalk.
- Serial Port Configuration and Port definition.
- Port Speed.
- Alarm clock.
- Application font.
- Serial printer location, Autokey rate, Autokey delay.
- Attention (beep) sound, Double-click time, Caret blink time (insertion point rate), Mouse scaling (mouse speed).
- Menu blink count, Monitor Depth, 32 Bit addressing, Virtual Memory, Ram Disk, Disk Cache
Resetting PRAM/NVRAM Steps
Step 1: Turn Off the Mac.
Step 2: Press the power button.
Step 3: Quickly Press and hold the combination of Command + Option + P + R keys before the white screen appears. Hold the four keys until hearing a “hip” sound and the Mac is rebooted again.