It's locked up and won't hard reset

[kerensa]

A couple of days ago my Nexus appeared to be switched off. I restarted it and it came up with the "Type password to decrypt data" message.

Now I had never set this option, so I was confused, but I tried a bunch of passwords, all to no avail.

So I thought I'd bite the bullet and hard reset it.

I pressed power and vol up/down and up popped an image of the robot on its back, together with the Start and up/down arrows. So far so good.

But then I realised that none of the buttons would work.

I repeated this a couple more times and finally I got the option to start the reset.

Screen switches to the Google logo and stays there - forever.

I've now run out of options. Anyone else seen this and got through it.

btw I've not rooted it, or installed any other dev tools on it.

Thanks

[birdastrompgman]

Try support.google.com/nexus

The first thing it says to try is holding the power button for several seconds.  Have you tried that yet?

[S.Prime]

Hold the power button down for 45 seconds and your tablet should reset.