Xtar TZ28 not working..

Hi all, I received my TZ28 from the Xtar 12th anniversary competition, but after trying 4 different batteries in it, seems not to work.
I just wondered if anyone had one of these and could offer any help, or perhaps I am doing something wrong (though I doubt it).
I don’t even get a flicker of light at any point.
I have contacted Xtar too, but thought I’d ask you guys as well.
Thanks in advance!