My Mac book will power up but the apple sign remains in the middle of the screen and a gear turning below it -nothing else happens -can you help?

my Mac book will power up but the apple sign remains in the middle of the screen and a gear turning below it -nothing else happens -can you help?

A couple of things to try:
PRAM reset by holding down cmd-opt-p-r on restart. Hold down the keys until you hear the second startup tone.
If you have a wireless keyboard, wait until you hear the startup tone, then press the keys.
http://support.apple.com/kb/HT1379
Boot into Safe Mode by holding down Shift key on restart. Same timing applies to wireless keyboard.
Safe Mode takes a while to boot. It will show a progress bar. It will boot to the login screen. Log in, then restart normally.
http://support.apple.com/kb/ht1455
Boot into Recovery HD by holding down cmd-r. Same note for wireless keyboard.  Once booted, run Disk Utility and repair Macintosh HD (or whatever you have renamed it).
http://support.apple.com/kb/ht4718

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