I just wanted to create an account to thank you guys.
I just installed the Hyper 212 EVO & a new 850 watt psu on my pc last night, and got this fan error. Mine just said, "CPU Fan error," and didn't give me the option of pressing F1. I was too tired to try & figure it out then. I was switching from a stck heatsink on an i7 960 (which I got the same error on when it wasn't seated right), on an Asus Sabertooth X58 mobo. I cleaned & regreased it TWICE, as I saw the fan spinning and thought there was no way that could be it. I'm rather new to pc building (March 2012 I just built my 1st rig). I unplugged & plugged the fan back in (there is only one place for CPU fan, and it is a 4-pin pwm fan/slot).
I decided to search, and found this thread after cleaning & regreasing this morning - the 2nd time (although I did have too much on the 1st attempt, most likely). This time it did give me the "F1" option, so I went into the BIOS, but there was only a way to monitor it, turn it off, or switch it from silent/normal/turbo. The rpm's were in red, but no threshold setting. I saw the CPU temp was ~40 Celcus (was ~50 Celcius idle temps), so I decided to exit & try to boot again. IT WORKED. Maybe it just wanted me to check this before it would boot? Not sure, but I changed each option in "power management" tab, and then switched it back (as it was all on the best options).
I just wanted to share in case any others have the same/similar problem. THANK YOU guys for all the support you give to your fellow PC enthusiasts. It makes me happy I decided to go this route for my future gaming. Now if I can only get used to the m/k