Does the fan turn freely with the power off? Have you tried turning the fan with the power on? Ron

Hi All My wife's S7/391 has just shown the same problem. The error was in the second block and nothing would repair it or allow the device to boot up the Windows 10 operating system. What I did in the end was to generate a Boot CD on another computer (Windows7 Ultimate), and use this in an external usb DVD drive to boot the Acer in Win7. This gave me access to the files in the Acer which I copied to a USB stick. Once I had the personal files backed up, I deleted the raid configuration, (along with all data and programs), and repartitioned/formatted the SSD as two separate hard drives, C and F. Windows 7 was then installed in C and data stored in F. (I consider Windows7 an upgrade from windows 10 ). (Note: I also changed the boot configuration in the BIOS to Legacy ). This reply is being written on the rejuvenated Acer and there are no errors yet - time will tell though. Ron