I've had it for about three weeks. It's fully charged, but it won't turn on. I've had nothing but trouble with this thing! Thanks for any suggestions 
Kent started a thread some time back on potential problems with dual coils on dual coils on ego batts:
http://www.e-cigarette-forum.com/forum/ego-type-models/560117-dual-coils-egos.html
So that might also be worth looking at as the problem, even though you say they worked before. Repeated stress can lead to a failure.
Or, hopefully, you're just putting them on too tight!
Thanks. I gotta get myself a single coil. Which one do you recommend?
Thanks. I gotta get myself a single coil. Which one do you recommend?