Macbook's fan question and 1st post

Hello everyone, I am new to the Apple discussions page and I have a bit of a problem with my Macbook which is now a year and one month old. Whenever I turn my Macbook on, after about 15-20 minutes the fan will kick in and never shut off. I am not doing anything which would use massive amounts of memory and hard drive space. It would click on even when it's cold. I tried to reset the systems management controller and also did an Apple hardware test and nothing came up. I checked my activity monitor and nothing was taking up tremendous amounts of resources. This problem never happened before this morning. The fan would only come on once the laptop got hot and then after about 10 minutes it would automatically shut off. Now it turns on when it's cold and never shuts off, it's really annoying, especially at work when everything is quite and all I hear is my laptop whizzing. Any ideas or thoughts as to why this might be happening?
Thank you!

I checked the activity monitor and it turns out that there was something called PrintJobMgr which I guess is a printing queue. Strange since I don't remember trying to print anything for a long time. It said that PrintJobMgr was using 99% of CPU, so I forced quit it and now the fans are quiet. Thanks a lot for your help! Really do appreciate it!

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