Advise needed! My situation: I've got second gtx670mx from the same seller I've earlier got my first gtx670mx. First card works like a charm. Second appears not functional. I've realised that when new arrived card was installed in master mxm slot, computer start booting wiht black/empty screen, three beeps, crasy spin of fan, emergency shut down and as a result - system crush. The seller advised to flash faulty card with stock vBIOS from my working card to avoid replacement procedure. So I've performed attempt of blind flash in master slot and also tried to flash in slave slot. NVFLASH (the latest) does not see mentioned card in slave mxm slot. So all attemps were unsuccessful. Any tricks or tips for the situation? What else can be performed prior to sending card to RMA? Thank you in advance!