X476dw doesn't boot! - Help

Hi,

I've purchased a brand new x476dw. It worked great for the first couple of days.

I then set up a scan email account via the web interface. Now, the printer won't respond and worse:

it won't boot! The net interface won't work, etc.

Booting hangs with the hp logo and the "loading" bar frozen.

Is there a hardware reset button somewhere???

thanks for any help!!