Installing a ROM on HTC One X+

Hi!
I got my hands on a HTC One X+ and decided to install a custom OS on it, because it had a old version of Android and I wanted to experiment.
Did pretty much everything needed, after that I installed CM12.1 and booted it up.
It worked, sort of.
The phone was stuck on the pulsating CM alien guy thingy.
What do I do?
Help pls.

Initial CM setup can take 15 minutes or more. At least it did on my M8. Nothing to worry about. Just leave the phone alone for a while.