Réponse à : « 3.5 HDD 5V Sensor »Hello. I have the same problem 0V with 3.5 HDD 5V. Both drives are unmounted and I can not run my computer without external drive. After replacement of HDD I can use the iMac but there is still an error with the voltage. Pram/Nvram smc reset takes no result. Can anyone help me to solve my problem ? Right now I have two drives (ssd pcie and 2.5” HDD unmounted with my files stored on them) outside the computer.