Very loud noise heeelp

I bought my macbook pro on ebay 2 years ago and have not had any problems with it until recently. It gets very hot when using it and makes a very loud noise if i smack the bottom of it the noise stops but recently it hasnt stopped andis getting worse. any ideas?

I suggest not 'smacking' your MBP.  The noise makers on a MBP are the fans and the HDD.  You could open the unit and see if dust and debris have accumulated inside and if so, clean it out.  Open Disk Utility>First Aid and run verify and repair.  Also running the Apple Hardware test might give some clues:
http://support.apple.com/kb/HT1509
If no problems are identified, than an appointment at the Apple store genius bar is in order.
Ciao.

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