"Hummed" as in it was spinning but not turning the engine over? If so, yes that is not normal.

At this point, it could be that your battery is a little low from sitting over the winter. It might need a charge or will charge itself as you use it. If this goes away, it was probably the batt.

If your brand new X series is not cranking when you turn your key, get ahold of your dealer! You've got a 4 year warranty, and a quality machine. Nobody gives a 4 year warranty on a inferior machine. Let your dealer handle it.

Roughly 5 days ago I took delivery of a X320. If I had your problems, I would've called the dealer long before I asked for opinions on GW. Not slamming GW at all, but I don't have thousands of dollars wrapped up in GW, I do with JD though.