Hello and thank your contacting Fixya Support, I will be glad to assist you.
-PMU RESET-
The Power Manager is an integrated circuit (computer chip) that is usually on the logic board of your Mac computer.
It is responsible for power management of the computer. It controls back lighting, hard disk spin down, sleep and wake, some charging aspects, and some input/output as it relates to the computer sleeping.
• If the computer is on, turn it off.
• Disconnect all the connections going into the Mac except for the Power cord.
• Once all connections have been disconnected, remove the power cord from the Mac.
• Wait 20 seconds.
• Reconnect the keyboard, mouse and power cord back into the computer.
• Press the Power button to restart the Mac computer.
Try this procedure and if it works, great, If it does not, just reply back to this post
and let me know.
Regards,
-Terry
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