What's that hissing noise

My Macbook pro is a year old and I use it for school, so have it on for hours every day. Just last week I began to hear a hissing noise, or is a fan? I don't know, but I've never heard it before. It's not real loud, but it's noticeable. Any ideas?

vision2020 wrote:
I too have this problems. I purchased my Macbook Pro July of 2010, and recently it began making a hissing noise. It makes the sound three times, and on the same pattern each time. Mine is also not that loud, but still considerably noticeable. What should we do?
Email me please! Thank you
If you still get the "hissing" sound after http://support.apple.com/kb/HT1411 Apple Portables: Resetting the System Management Controller (SMC) check out the following:
Mac OS X 10.6 Help: Checking a disk to see if it’s going to fail
Failing Hard Drive Sounds
How to Tell When Your Hard Drive is Going to Fail
If you have AppleCare, give them a call.  If not, take the computer to your local Apple Store or AASP if no solution is found in these communities.
================
Regarding responding to your emal addy, we ask that you post all questions to the appropriate discussion forum. This allows other users and other helpers to have a chance to view and respond to your post. That way, everyone benefits from the exchange.
Lucky for you, you did not provide your email addy. 
Never post your email address in a public forum.  Spam bots roam public forums looking for "spam victims".   If you insist on using your email address in a public forum & you want to "trick" the spam bots, then suggest that instead of using "@ "in the email address, use instead the actual word AT. 
Or go to the top of this website to "My Stuff>Preferences." Every reply to your post will be emailed to you.
Thank you

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