TX850 with strange sounds

Hi,



I have one TX850 that´s making strange buzzing sound, asked for RMA and the unit they sent me has the same problem, now i have two psu´s with the same problem, now i need to know what to do to solve this situation because i have to send the power supply or my card will be charged with the psu price.



Thanks if anybody can help me.



My ticket number is 6340480.