Well this is a replacement model I got and this one seems really strange. As soon as I set up it for the first time, maybe like 20 minutes later, it started to rev up is fan system to about 4500 RPM. So then I installed a few updates, installed the programs I needed and restarted the computer. It made the sound once every 45 minutes, and the CPU was using 14% even though the only program on was... nothing... After I restarted the SMC, it didn't make the sound for about another I don't know 6 hours? I was just using it to listen to Spotify while reading a book. But all of a sudden when I opened iTunes and got bored of reading and started to just watch a simple iTune key note, it decides to rev up its fan again to about 4900 RPM when the temperature was only at 45~47 C. By the way the laptop rev's up is fan and then comes back down about after 10 seconds. Is this normal? I never noticed any of my previous MacBook's revving up is fan under 60 C. Alos, I don't know if it's important to mention, but the laptop got the color wheel in safari when it wwas opened up in a new pane two times which wouldn't stop until I force quitted Safari.