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If your M-Audio device is not recognized after installing the latest drivers, or if you are experiencing system instability after installation, reset the parameter random access memory (PRAM) and nonvolatile RAM (NVRAM) on Macintosh computers. PRAM stores certain system and device settings in a location that Mac OS X can access quickly. Exactly which settings are stored in the computer's PRAM varies depending on the type of computer as well as the types of devices and drives connected to the computer. Parameter RAM is a small area of non-volatile RAM (NVRAM).
Note: If PRAM is reset, you may need to verify your display, time zone, startup volume, and volume settings using System Preferences.
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.
Your computer's PRAM and the NVRAM are reset to the default values.