Macbook pro gets stuck on the startup screen...

This question is a little odd as i am typing it off of my macbook pro right now, but my macbook fell of my bed and then it froze. I then resarted it and it just sat on the start up screen with an ideling circle under the apple logo along with a loading bar at first. I let it sit for about 25 minutes and then realized that it was going to work.  I then tried to restart it in safe mood and that didnt work and i dont have the disk so i cant boot from that but then i tried this...
Hold command S on start up and then type
/sbin/mount -uw /
and then
chmod 775 /
and then
exit
After that it booted up and now i am using it as previously stated but my only probelm is turned it off to see if it would come back on no problem and it doesnt i had to go through the same commands over again to get it to work.  So any suggestions on how to get it back to normal?
Thanks

Try resetting the Pram
http://support.apple.com/kb/ht1379
and Smc
http://support.apple.com/kb/ht3964

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