Nexus 9 locked

[Android Central Question]

When I opened the N9 this morning all I had was the word Google showing intermittently on and off. I tried to power down but the same happened. I tried longholding volume up or down and a notice came up that the device was locked. There were options for HBOOT, REBOOT, FACTORY RESET and POWER DOWN. Only power down did anything. Switching on again gave a battery recharge icon. The N9 is fully charged. Has anybody seen this before, please?

 

[B. Diddy]

Welcome to Android Central! Try booting into Recovery and wiping the cache partition: https://support.t-mobile.com/docs/DOC-31639