The Toshiba Portege Z935-st4n04 cooling fan from us is brand new,100% compatible with your original laptop cpu fan. Each Toshiba Portege Z935-st4n04 fan should be under strict quality control before leaving the factory, and has passed the authentication of CE, UL, EMC, CQC,ROHS, etc. 30 days money back and 6 months replace warranty.