Is it normal for my macbook pro to buzz when i turn it on?

hello everyone!
I am one of the many people that got a mac for christmas this year.  when I opened it, it looked like a normal macbook.  after setting it up I messed with it a little to see what i could find (i used microsoft prior to this all my life; and im only 15).  i was on it all that day, it started getting late so i decide to shut it down because i was sure i wasnt going to use it for a while.  so about 3 days after i opened it i turn it back on, and to my surprice it made a wierd buzzing sound.  i showed my dad and his thoery was that it could be like a fan or some other thing that spins inside.  i ignored it, and now every time i turn it back on it does that.  i have notice that it doesnt do it when i wake it up only when i boot it up.  can anyone help me, please!!!  i need to know if i got a deffective one so that i can take it back to apple.
BTW its a macbook pro 13" and it is the basic-off-the-self modle.  i havent upgraded anything or opened it up.  

The sound you're hearing may be the optical disk drive sort of 'whirring' at start-up. If that's what it is, that's perfectly normal - you're MacBook Pro is just 'checking' to see if there's a disc in the drive when it boots.
If you don't think that it's the typical optical drive 'whirring', then take your machine into your local Apple store or an AASP and have them diagnose the machine... but I'm thinking that what you're hearing is the optical drive.
Good luck,
Clinton

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