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lets try these two steps to see if we can get some life back into your mac.
First, unplug the charger if its plugged in.
Shut down your Mac.
Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on your Mac.
Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears.
Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.
Release the keys.
If you cant get that to trigger.. Lets try the following next
- Shut down the computer.
- Plug in the MagSafe or USB-C power adapter to a power source and to your computer.
- On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
- Release all the keys and the power button at the same time.
- Press the power button to turn on the computer.
the second option is more likely to be the one needed. But lets try both and see if this helps the situation, or not.
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