Macbook pro 13" (late 2011) makes a single loud sound on start-up?

Hi
This noise never used to happen before but since a few days it makes a loud single deep-chimed noise when it starts up then the normal screen comes on 10 seconds later?
Is this normal or is something wrong?
Please help.
Thanks

You did not mention which os is installed on your computer.  Anyhow, since it is a "late" 2011, you are still under warranty. 
Call Apple Care.  
Take FULL advantage of your warranty.  Posting on a message board should be done as a last resort and if you are out of warranty or Apple Care has expired.  

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