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Is your Mac fan being loud? Try This
Reset your SMC (System Management Controller) and PRAM (parameter random-access-memory). Sounds hard and scary but its really not, its just a bit mysterious.
Resetting your SMC
**I took these from the Apple website (http://support.apple.com/kb/ht3964). If you have an iMac you can see the instructions there.
- Shut down the computer.
- Disconnect the charger from the computer, if it’s connected.
- Remove the battery.
- Press and hold the power button for 5 seconds.
- Release the power button.
- Reconnect the battery and charger.
- Press the power button to turn on the computer.
- Shut down the computer.
- Plug in the charger to a power source, connecting it to the Mac if its not already connected.
- 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.
- Note: The light on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
Resetting your PRAM
- Shut down the computer.
- Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Immediately press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
- Continue holding the keys down until the computer restarts, and you hear the startup sound for the second time.
- Release the keys.