Your MacBook's PRAM, or Parameter Random Access Memory, holds device settings and system information for your computer. Generally, the PRAM controls display resolution settings, volume information and kernel panic information. You can sometimes cure crashes and odd behaviour by resetting the PRAM, but this will not cure network problems in OS X.
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Open the "Apple" menu on your MacBook.
Select "Shut Down" from the drop-down menu. Let your MacBook turn off.
Press the "Power" button on your MacBook to turn it back on, then press and hold the "Cmd", "Option", "P" and "R" keys simultaneously before the grey screen appears on the computer's display.
Release the keys after your MacBook restarts and you hear the second start-up prompt sound. The PRAM is reset.
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