Hi , Mine is behaving the exact same way. It just stays on white Led , doesnt show up on my network and i cannot access it. I have logged a report at support portal. It is so frustrating cos i have tons of info i cannot access now… i wish i also had an answer
It sounds like the Update Firmware was left on Automatic and your My Cloud has done the update. If you have a lot of Vdieos, Movies, and Pictures loaded, then it is probably Re-Scanning. The My Cloud has limited resoures to work with so it becomes unresponsive until the scan is complete. How long this takes totally depends on how you have your Shares setup + the Twonky Server.
Try this next. Pull the power cable from the MyCloud and leave it for a few minutes. Push and hold the reset button and then plug the power cable back in to the MyCloud. Continue to hold the reset button for 40 seconds.
If the system restore succeeds, you should be able to access the dashboard to reconfigure the settings. Disable the iTunes server and media streaming services. Set up the MyCloud with a static IP address outside the range of the DHCP pool.