How to reset SMC & PRAM on Macbook Pro & Air (El Capitan)
Sometime some devices such as USB ports or HDMI port not functioning properly. There are something called “SMC (System Management Controller)” and “PRAM (parameter random-access memory)” on your macbook and if there is a problem or crash on the SMC or PRAM, your macbook pro retina might not work correctly. In this case, SMC and PRAM needs to be reset. Here is an easy solution you should try to fix this issue before you bring it to the Apple Store.
Symptoms you might have due to SMC or PRAM collision:
- USB ports not reading (USB or external devices not recognizing)
- HDMI ports not working
- Battery not charging (Won’t charge to 100%)
- Cooling fan not spinning too slow or too fast
- MacSafe Power adaptor indicator not displaying
- Volume key not working (Sound issues)
- Screen Brightness control not working
- Backlight Keyboard not working
- Network Issues (won’t connect on Wi-Fi or bluetooth)
NOTE: There are two different MacBooks. One with a removable battery, one with a built-in battery. Use the right method for your MacBook!
How to reset SMC with a macbook with built-in battery
Step 01. Shut down your MacBook.
Step 02. Connect the MagSafe power adapter into your MacBook. If it’s already connected, leave as is.
Step 03. Press Shift + Control + Option + Power keys at the same time.
Step 04. Release all the keys from the keyboard.
Step 05. Press the power button to start your MacBook.
How to reset SMC with a MacBook with removal battery
Step 01. Shut down your Macbook.
Step 02. Unplug the Magsafe Power Adapter from your MacBook.
Step 03. Remove the battery.
Step 04. Press and hold the power button for 5 seconds.
Step 05. Release the power button after 5 seconds.
Step 06. Insert the battery and plug the Magsafe Power Adapter back in.
Step 07. Press the power button to start your MacBook.
How to reset PRAM for All MacBook Laptops
Step 01. Shut down your MacBook.
Step 02. Press and Hold Option + Command (⌘) + P + R.
Step 03. Turn on your MacBook while holding the keys (Option + Command (⌘) + P + R).
Step 04. Keep holding the keys (Option + Command (⌘) + P + R) until your MacBook restarts (You will see the grey screen appears before it restarts.)
Step 05. Release the Keys.
Step 06. If you hear the startup booting sound for the second time, that means the PRAM has been reset.