A customer uses her MacBook late at night and occasionally has to restart. Despite having muted the speaker volume, the MacBook always plays the startup chime loudly. What step should you try first to resolve this issue?
A. Reset the SMC.
B. Reinstall OS X Lion.
C. Repair disk permissions.
D. Reset the PRAM/NVRAM.
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Resetting your Mac’s PRAM and NVRAM

Resetting PRAM and NVRAM

  1. Shut down the computer.
  2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  6. Release the keys