My Western Digital NAS suddenly became inaccessible and the power light flashed blue.

My Western Digital NAS suddenly became inaccessible, and the power light flashed blue. It had been running for three or four years without any problems, but this situation suddenly occurred, and the power light flashed blue after restarting. Is there any way to fix it? Thank you very much.
My device model is this
WD BVBZ0120JCH

Hi @Zhanghao,

Please refer to the KBA article: Resolve Power LED Blinking White, Blue, or Solid Amber on a My Cloud

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting: