Resetting PRAM and SMC is one of the common troubleshooting techniques followed on the Mac. Most of the time simply resetting PRAM and SMC could solve simple problem on your Mac. Resetting PRAM and SMC could fix Bluetooth problem in Yosemite running Mac.
Resetting PRAM and SMC on your Mac is much easier than thought. Follow this step by step tutorial to know how to do it.
How to Reset PRAM on Mac
Step 1: Shut down or turn off your Mac.
Step 2: Restart your Mac.
Step 3: Hold down this key combination simultaneously right after restarting, but before the gray screen appears.
Command + Option + P + R
Step 4: If you hear, Mac boot chime while holding down the keys it means your PRAM reset is successful.
Step 5: Now you can let go the keys.
Now your Mac will start up normally, however you many need to configure your peripherals settings. You can read more about PRAM in apple support forums.
How to Reset SMC on Mac
Resetting SMC is much easier than resetting PRAM. Follow these steps to do the same.
Step 1: Shut down your Mac if turned ON.
Note: If you have any application running on your, which is not responding then you can force it to close by pressing Command + Option + Escape.
Step 2: Unplug your Mac’s power cord and battery (if it is removable).
Step 3: Now one by one, unplug every peripheral device connected your Mac.
Step 4: Wait for few minutes (minimum 15 seconds).
Step 5: Connect Mac’s power cord and insert Battery.
Step 6: Wait for few seconds more and restart /reboot your Mac.
Step 7: Now you could connect back your peripherals to the Mac after restart.
The System Management Controller (SMC) is responsible for many low-level functions on Intel based Mac. These functions include responding to presses of the power button, responding to display lid open and closing, Sudden Motion Sensor (SMS) management, Keyboard backlighting, Ambient light sensing etc.