Hello. I updated my lenovo BIOS to the latest version. All went OK. However now the fan goes crazy. It goes very fast then slow, fast then slow, like a loop cycle. Before it did not happen. I installed Fan Speed monitoring software and both of them don't detect it. I want to install my old bios however I did not back it up. I tried to search for factory bios, I can't find it. So I decided to install a Modded Bios and unlocked, perhaps it will work? I do not know what to do to solve this fan problem. I tried using Linux Ubuntu Live CD and it's the same, it's not a Software problem but BIOS i think. Please, help me. Thanks in advanced.