reset SMC,PRAM, and NVRAM on your MBP
http://www.macworld.com/article/2881177/how-to-reset-your-macs-nvram-pram-and-sm c.html
How to reset NVRAM (or PRAM)
If your Mac is not booting correctly or one of the functions listed in the previous section is acting strangely, you can perform a simple reset of your Macís NVRAM or PRAM. Resetting your Macís NVRAM or PRAM will reset the data stored to its default setting. (Note: As always, we strongly recommend having a complete backup of your important data before troubleshooting your Mac.)
The process for resetting PRAM and NVRAM is exactly the same. Simply follow these steps:
1) Turn your Mac off.
2) Turn on your Mac and when you hear the startup chime, immediately press and hold the Command-Option-P-R keys. (Note: You may need a wired keyboard for the reset).
3) Hold the keys until the Mac restarts and you hear the startup chime for a second time and then let go of the keys.
After resetting NVRAM or PRAM you may need to reconfigure some of your Macís settings. If you are still having issues with your Mac, you might want to consider resetting its SMC.
What is SMC?
On Intel-based Macs, SMC stands for System Management Controller. The SMC chip controls your Macís sleep function, power, various lights and indicators, fan speed, and keyboard backlights among other things. So if your Macís fan is out of whack, indicator lights are misbehaving, it wonít respond properly when closing the lid, or the Mac wonít turn on at all, you might want to reset the SMC. (Note: Again, be sure to have a complete backup of your important data before resetting the SMC)
How to reset SMC in a MacBook with a non-removable battery
1) Shut down the Mac.
2) Connect your power adapter to your Mac and to a power source.
3) With the Mac powered off, press Shift-Control-Option and press the power button at the same time.
4) Release all keys and turn on your Mac.
