Use this blog to fix the problem, http://newandroidbook.com/Articles/Nexus9.html
Try using this instructions with adb
adb shell
echo c > /proc/sysrq-trigger
Type: Posts; User: 413ph
Use this blog to fix the problem, http://newandroidbook.com/Articles/Nexus9.html
Try using this instructions with adb
adb shell
echo c > /proc/sysrq-trigger