Console will not boot after long storage
A company I work with similarly experienced a very long boot after returning to the venue. I believe either cycling the power or disconnecting the network resolved the issue.
Just to update - console returned to ETC and co-processor board replaced. Now hardware OK
This also happened to me during an update, but at the time in 2.xx. And it was not a hardware pb. Since then I made a bootable key
www.etcconnect.com