I have the Giga T Pro II also and use it with my D600 and D800. There are three cables provided with the Giga T Pro; two look very much the same, but are different. I believe one works with the D7000, and the other works with the D600. I mistakenly used the D7000 cable first and had the same symptoms you see (lights work, no shutter release). When I used the correct cable, everything worked fine.