Chromebox for meetings has become a brick (Yellow Exclamation and not much else)

Hi,

I have a chromebox for meetings. 

When it boots up we get a Yellow Excl. Mark.  And Ctrl+D doesn't work.  No button pressing does.

So what do I do from here?

I called DELL for a warranty repalcement but once I put in my EX number the automated response was:

"Support is not possible due to a technical issue" "Please try again later".

LOL - even the technical support needs technical support.  Who is going to help me?

What I think has happened - The HDD has broken.  It can't even find it to boot.

How do I get this fixed please?