Why isn't my Nexus 10 loading after Android 5.1 update?

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AC Question

Nexus 10 not loading after Android 5.1 update

Help! A notification for the Android 5.1 update popped up so I clicked on it. Then it said it would reboot, but now it is stuck on the circling dots. It was stuck on it for about 10 minutes so I pressed the power button to restart it. After holding down the power button for about 7 seconds, it went blank, let out a beep, displayed "Google" briefly before going back to the circling dots. Did I ruin my Nexus? It doesn't even turn off now. Dots have been circling for the past 30 minutes. Please help, I use my Nexus for work and this is making me feel sick.