My MacBook Pro is stuck on the loading screen and sounds as if its about the take off?!

Hi everyone. About 3 hours ago my laptop suddenly became very unresponsive and began freezing a lot. I cleared the cookies on Firefox, but the problem carried on so I tried rebooting. Now it has been stuck on the loading screen for about half an hour, sounding like a rocket ready to take off.. I brought it second hand and I don't have an installation CD, at least if I do it's not here at uni with me anyway.. Any ideas?! Thanks

Not knowing what your os is very difficult regarding offering troubleshooting solutions.  Most if not all the system discs are machine specific. 
Replacement System Discs can be obtained from Apple's Customer Support - US (800) 767-2775 for a nominal fee. You'll need to have the model and serial number of your Mac available. 
If you're not in the US, you may need to go through the regional Apple Store that serves your location to find the contact number - http://store.apple.com/Catalog/US/Images/intlstoreroutingpage.html
Mac OS X versions (builds) for computers 

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