Posts: 105
Threads: 20
Joined: Aug 2011
I would probably contact HP and first ask for a free replacement door, rather than buying one. Since it was a new calculator and you were almost certainly handling it gently, it might have been a void or flaw in the molded plastic piece. (Examination of the fracture under a magnifying glass can sometimes be helpful in this effort)
Small areas in molded parts are sometimes diificult to fill with the polymer during the molding operation. They might appreciate knowing this is a part that is prone to failure. It could be an under-designed part or a start-up problem.
Now, if you were fumbling, tearing at the packaging, and being ham-handed due to the excitement of actually seeing a new RPN HP (and who among us could blame you ?)it might actually be your fault. You will have to judge.
Good luck