Thanks for reaching out. I am sorry to hear that your Google Nest Hub is not powering on. I understand your concern and would be more than happy to help you.
I am unable to determine your warranty, however, I have made a case for you so that the support team can help you.
The support team will be able to look deeper in this issue and determine your warranty and next steps. This will be sent to the email address associated with your community profile. Your Case ID is: 7-9286000032062.
We haven't heard any updates from you. I'll go ahead and lock this thread. If you're still experiencing problems, feel free to contact the support team and refer to Case ID listed above, or start a new thread and we'll be happy to help.