If you think that your device is not responding or is having issues in booting up the device . Please follow the steps suggested here.
TIP: Always take backup of your device before making any changes in the device.
Now, if you think your device is facing issues with regards to booting up.
1. Online: Visit mysonicwall.com. Once logged in select Resources & Support | Support | Create Case.
2. By phone: please use our toll-free number at 1-888-793-2830. Please have your SonicWall serial number available to create a new support case.
If you do not have a mysonicwall.com account create one for free!