Well, let's see...
First off, you go into recovery and wipe data/factory reset as well as dalvik cache.
Now you install the rom zip from recovery.
Now boot into bootloder > fastboot
Now find the boot.img that was/is INSIDE the rom zip that you are trying to install.
Flash it using fastboot flash boot boot.img
Reboot and it should boot fine, if not go into recovery and once more wipe everything, and flash the boot.img again.
Again, just to make sure,
You extract the boot.img from the ZIP that contains the rom you want to install, and put it inside the folder with your adb and fastboot.
HTC ONE X endeavorU
16GB Orange UK
Stock WWE 4.2.2 - Rooted
HTC Sense :
1.36 Unlocked S-ON
CMW Touch 184.108.40.206
Additional Devices: iPhone 5 running iOS 7.0.2