Mac Troubleshooting
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Smc - System management controller
On Laptops CTRL Shift OPTION then press the Power button for 2 seconds. The computer should not turn on, but reboot twice. On Desktops, Shut the computer down for 15 seconds, unplug, plug back in wait 5 seconds, then turn on. Press and Relese the Power Button. The computer will restart until you release the key combination. Let it reboot about 3 times.
Resetting The NVRAM (pram)
Press and hold the Command, Option, P and R Keys
Starting In Safe Mode
Hold the Shift key and Power on
Starting in Verbose Mode
Turn off Machine Hold the Command and V keys then power on.
Starting in Recovery
make sure machine is turned off Hold down the Command and R keys then power on. You can reset password from Revovery mode. Open terminal in recovery mode, Type 'resetpassword'