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"vrm" <mr.vrm.tm@gmail.com> wrote in message news:ghlhdp$d7j$1@trimpas.omnitel.net...
> "The Power Management Unit (PMU) is an integrated circuit (computer chip) typically found on a computer's logic board. 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.
>
> "If the settings in the PMU become corrupted, it 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 your computer's PMU.
>
> "Resetting the PMU will not resolve issues in which the computer stalls or is unresponsive. A PMU reset should only be used as a 
> last resort in the case of a hardware failure or when the power management system is suspected. Resetting the PMU returns the 
> computer hardware, including NVRAM, to default settings and forces the computer to shut down."