No right channel in new cartridge


I just got a Sumiko Blackbird & mounted it.  I have no right channel. I haven’t fine tuned the mounting but, That shouldn’t make me lose a whole channel.  Once or twice I’ve heard a hum in the right channel before I put the needle down. When it goes down it stops & goes silent.  The channel isn’t effected in CD, DVD or radio.

i bought it here(all positives on the seller) & it only had 10 hours on it. It didn’t come in the original box but came screwed into a box... seemed pretty secure.  I checked & reconnected all the pins, jacks into the AVR & ground wire.

What should I try next?
tochsii
Well, now that you know it is defective, why not send it back and get either a refund or purchase something comparable?
B
I inquired to a fellow on A'gon a few years back on getting a certain price on a used cartridge he was selling. He verbally agreed on my lower price, but that same day I went on the forums about cartridges and low and behold, there he was talking to another audiophile about the same cartridge he was going to sell me. He told the other guy the cart. had a serious channel imbalance. This ended my pursuit of his cartridge. Yes, I got lucky on that one....
@tochsii I hope you understand that defective MC cartridge (with one channel off) cost no more than $50. And even fully refurbished cartridge can't cost as much as the original.    
One thing: it is sometimes the case that pin orientation is different from cartridge to cartridge. Maybe it’s just miswired. 
Chakster, is there a website where defective cartridges are sold exclusively?
i just wonder how you know so definitely the value.

tochsi, my own opinion of the sumiko is not high, even with 2 good channels. Do what you like, but I’d take the opportunity to get out of the deal, if I were you. You seem like a good guy, so good luck either way.