Resetting the PMU
The Power Management Unit (PMU) is an integrated circuit (computer chip) typically found on the logic board of Macintosh computers. As its name implies, the PMU is responsible for managing all aspects of the computer's power. It controls hard disk spin down, sleep and wake, some charging aspects, and how any devices attached to the computer affect sleep.
Corrupted settings in the PMU can result in operational anomalies such as your computer not turning on, not displaying video, or not waking from sleep, among other things. In these situations, you may need to reset the computer's PMU.
Resetting the PMU will not resolve issues in which the computer stalls or is unresponsive. A PMU reset should be used only as a last resort, as ...
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