Hi i have recently ordered and received my new MacBook Pro 15" MD103A. My problem is, that since yesterday my FAN is always at 3500RPM no matter what i do. I is kind of disturbing. What i did so far: 1) Installed new Memory: 16GB Corsair Venegance + Memtest 2) Copied over some old files from my old MBA 3) Installed a some software. To make some "Performance" test ive installed Valves-Steam and HalfLife2 and ran it at maximum settings. No Crash No Problems Loud Fan ^^. And i feel like since i did that my Mac is always loud. MiStat currently says that all temp. sensors are below 40°C but the Fans are at 3500RPM. I already did a SMC Reset. Attached are some MiStat Statistics. What should i do? EDIT: I just ran the Diag. Tool by Apple - no problems found I booted up in Safemode - no difference I removed all start up items - no difference I listened carefully: During the Diag. the Fans were silent. Just for 2 times they were pushed for 2 sec. When i boot the system up, the MAC is silent just 3 secs before the login interface appears the Fans go up.