My Cloud is constantly on offline?

One possible fix for a fast blinking blue front LED on a second gen single bay My Cloud was posted in another discussion:

Run a disk check via SSH or Telnet:
e2fsck /dev/sda3

Putty: https://www.putty.org/
usbrecovery.tar.gz: https://wd.hides.su/fox_exe/WDMyCloud-Gen2/usbrecovery.tar.gz