Talking Help install JB ROM on Desire X

I have ICS hboot with TWRP for ICS in my Desire X. Whenever I try to install any JB ROM it doesn't boot up, just shows a black screen. What should I do? If you are saying me to S-OFF, I already tried to do that(with RUMRUNNER) but it betrayed me finally saying to try with a new kernel or a new ROM. Why there is so much complication? I just want to install a JB ROM. Can anyone help me with this? Will be thankful