New computer decision

Hello fellow PCMR members! Im currently planning a new build that will cost me just under 1500 euro and im left with just one part, the case( Lian Li's PC-O11 Dynamic) has no case fans included. I need a bit of help here because i want to get 6 corsair LL120 fans but its slightly confusing. The...

I pulled my fans out to clean them put them back in . now it powers up and turns off but beeps first