If the fan is blowing all the time then resetting the SMC can help.
This performs a lot of functions and among them is the system fan, if your Mac has one.
The NVRAM/PRAM is not the only component that stores system settings and there is another called the SMC, short for System Management Controller. Relase the keys after the second startup sound (old Macs) or after the second Apple logo appears (new Macs). Let go of those keys and the Mac will then boot up as it normally does, but with default NVRAM/PRAM settings.Īfter resetting the NVRAM/PRAM, you might need to open System Settings and select the startup disk, screen resolution, time, and sound if the defaults are not to your liking.
Press the power button and straight away press and hold down the Command+Option+P+R keys. To do this, turn up the volume to the maximum, then power off your Mac. It remembers the screen resolution so it can restart with the same settings, and more.Īny problems you are having with these components, and a few more, could be caused by corrupt NVRAM or PRAM and may be fixed by clearing it and started with a clean slate. It stores the name/location of the startup disk in case you have two or more drives, or partitions with Bootcamp and so on. NVRAM or PRAM is used to store information like the speaker volume so that it is set at the same level next time you power on. A new one is required - get expert help because it is on the motherboard.Įven if the battery is OK, for some unknown reason the contents of this memory can become corrupted or it might contain wrong settings and this can affect the running of the computer. If an iMac keeps forgetting things like the sound volume or time zone, it may be becuse the battery is dead. MacBooks have a big battery of course, but desktop iMacs have little one too, so they can maintain the NVRAM contents. Basically, it is memory that retains its contents even when the power is switched off. On old Macs it is called PRAM, which stands for Parameter RAM, but on recent Macs it is called NVRAM (Non-Volatile RAM). The Apple Mac has a small amount of special memory that it uses to store a variety of important system settings. If you have tried everything else and problems persist, try these tricks. Hold down these keys when the Mac starts up to fix a variety of strange problems with Apple iMacs and MacBooks.
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