Hey guys, so I have 15" Macbook Pro Retina. Today I accidentally pressed something while turning my Macbook on, and somehow the login wallpaper was changed into Apple wallpaper default (the mountain with orange sky). After a while, I realised my fan sounds so loud and my Macbook gets so hot without me doing anything (I just have my safari and mail on the run). I've already tried to do the SMC restart (the one with shift + ctrl + option + power button), and it didn't work out. I've also tried to put my Macbook to sleep, then restart it, then shut it down, also didn't work out. I even tried to reset my PRAM (don't know why I do this, just want to try everything), and it still didn't work out. Could you guys help me please? I really need to use my Macbook to do some works, thanks guys.