Hello, I just bought my FIRST laptop. It's a fujitsu esprimo V5535.

I got a question, is it normal the cpu fan will have noise? I remember the first day I did not hear any noise, only starting yesterday I notice the cpu fan noise during midnight quiet enviroment.
If the cpu fan noise is abnormal, what should I do? The salesman said the first week usage if found manufacturing defect, he'll replace a new unit for me. But I installed so many things ready.....