I know I'm probably overreacting big time (!), but I don't have anyone to consult it with, so please, bear with me . I ended up buying 13" Retina. It came a week ago and I loved it instantly; thing was dead silent, fans were kicking in when doing some hard tasks only. It was like a Holy Grail, especially having experienced big fan + HDD issues in my PC. It being so quiet made me even more pleased with the switch. Now however, for like two days fans started to kick in just after booting up the computer. It's not very noisy or anything it just makes me wonder: is it supposed to be like that or maybe is this just going to get worse and worse; should i replace my unit then? I might add I tried booting up the computer being very cold after several hours of break from using it; temperatures were normal, v. low; so i dont understand why the fan is on? I wonder, the noise comes just from the left side of the computer, the right side is completely silent. Any guesses? Should I install SMC FanControl? I know it may seem crazy, and if so you are welcome to point that out obviously hah. I'm sorry for all these stupid questions, I'm still new to Mac + I'm within my 14 days return time and I want to save myself all this hussle later (I cant handle any more after having so much trouble with PCs lately). I'm not from the US, there's no Apple stores, my only option is to return it online, that's why I'm asking all these questions here. Thank you in advance!