Do this jobs when you have some troubles with your Mac OS X.
PRAM/SMC/PMU
The PRAM
The Parameter RAM is a small amount of "nonvolatile" RAM (NVRAM) that holds various settings that the system can use before the operating system loads, and maintains these settings even when the computer is turned off. There is a small battery on the computer's mainboard that helps maintain the PRAM settings when power is off.
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- Volume changes or won't stick.
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- Video resolutions not sticking or not all available
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- Time zone information and clock settings
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- Boot volume isn't set (question mark shows briefly before booting)
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The System Management Controller (Intel Macs) or Power Management Unit (PowerPC Macs) is a chip that manages the power for various system components such as the fans and backlights, as well as the circuits that initiates power to the whole system when you turn on your computer.
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- Battery isn't charging properly
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- Display brightness won't work properly
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- Keyboard backlight won't work
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- Fans blaring all the time
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