If you have a USB drive attached to the My Cloud disconnect it from the My Cloud, then try performing a 40 second reset again (if you haven’t done this troubleshooting step already).
If you are using any web browser extensions, like those to prevent ads or scripts, make sure to disable them before attempting to access the My Cloud Dashboard.
As a troubleshooting step connect the My Cloud directly to the computer’s Ethernet/networking port and power the My Cloud on. Check the front LED to see if it turns blue or continues to present the current issue.
