When i switch users internet becomes unresponsive, also started to hear the fan when just using normally

Question

Hi
Had my macbook pro for nearly 9 months now and noticed a couple of odd things.
1) When i switch from one user to another and i try to go onto the internet i get a page is unresponsive message.
2) I've started to hear the fan when the computer is just doing normal activities like surfing the net etc
I have googled and cant find anything similer, any ideas?

Answer 1

4,000 RPM for idle load seems excessive, 2,000 is usually the norm.
There could be various reasons for this:
1: Dead sensor or fan, the other is compensating. - #3 Hardware Test needed.
2: Need a SMC reset - #1 SMC Reset.
3: You installed something that has a background process and hogging CPU cycles.
Open Activity Monitor > All Processes and click on the CPU to sort the highest to the top and see if something unusual is hogging cycles.
Step by Step to fix your Mac
Other possible reasons:
5: You have done something to place excessive and sudden demand on the processors at one time, thus the software is trying to anticipate that and pre-emypt your behavior and run the fans at a higher speeds in advance.
6: Your machine is in a excessively hot environment
7: Your machine is in a excessively dusty or animal environment and the exhaust ports are clogged with animal hair/lint., will require cleaning by Apple if still under AppleCare/warranty.
8: There is malware on your machine, or your third party software is no functioning correctly leaving processes running.
9: OS X needs to be reinstall on the machine. #8 Reinstall Just OS X
10: You have a corrupted cache file. #12 OnyX cache cleaning routine.
11: You have a 13" MBP and have been trying to 3D game on it, didn't wait for it to cool down.