Nexus 10 does not boot after Update

After attempt at installing software update to Nexus 10 tablet will not boot. Have wiped Cache and even then did a factory reset. Nothing. Google appears and then twirling colorful dots and nothing. For hours just twirling dots., Samsung and Google and Best Buy geeks says nothing they can do. No longer under warranty but very upset since tablet was working great until update. I am not very tech savvy but can anyone help or do I just have a new paperweight? Thanks for any advice.
I have not made any modifications to the tablet.