HELP: No sounds out of my tweeter.

I own BW800 Diamond. I just bought a used pair of interconnect to use from my pre to amp. When I hooked them up I HEARD A LOUD EAR PIERCING HUM OUT OF MY RIGHT SPEAKER. I immediatly turned off my system. I then put my old cables back on and the hum was gone.

Now the diamond tweeter out of the right speaker is no longer working. Do you think it's the xover or the tweeter that got fried. What do you think caused this? Is this easy to fix? If the problem was caused by the interconnect. Should I hold the seller of the IC responsible?