The computer doesn't respond to the power button when pressed. The display backlight doesn't respond correctly to ambient light changes on Mac computers that have this feature. Battery indicator lights, if present, appear to behave incorrectly (on portables that use non-removable batteries). The Status Indicator Light (SIL) appears to behave incorrectly (on Mac computers that have an SIL).
The keyboard backlight appears to behave incorrectly (on Mac computers that have this feature). The computer's fans run at high speed although the computer is not experiencing heavy usage and is properly ventilated. The System Management Controller (SMC) on a Mac can sometimes cause unusual system behavior, such as: Reset the System Management Controller (SMC) Hold the keys down until the computer restarts and you hear the startup sound for the second time. You must press this key combination before the gray screen appears.ĥ. Press and hold the Command-Option-P-R keys.
You will need to hold these keys down simultaneously in stepĤ. Locate the following keys on the keyboard: Command, Option, P, and R. To reset the PRAM and NVRAM, we’ll do the following for Intel-based Macs:Ģ.
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