Lenovo Y50-70 - pulsating/clicking fan problem

Hello,

First of all i want to apologize for my bad english

So i have a problem with my unlocked/modded Lenovo Y50-70. The big fan does some weird noises around 40C. It sounds like a ticking old clock inside the laptop.




This problem only appears on (i think) all Bios Versions < V2.01. I dont have this problem on V2.01. A few days ago, i bought a new wireless card. So it was necessary to flash a modded Bios Version, cause Lenovo integrated a white list in their Bios Versions. But to flash a modded bios version it´s necessary to do a downgrade on bios version v.1.14 and on this version i have the pulsating/clicking fan problem . I already tried to flash a modded v2.01 over a modded v1.14, but this doesnt really help. So my question is, whether there is an option in the advanced bios menu or something else i can do to fix the problem.


Thanks