take it easy a bit, flashing RUUs, changing CIDs, Kindle Fire sideload youtube etc. is rushing things a little, especially with S-On!! ... and S-Off can wait.
especially without a "fastboot getvar all"
at OP, please start by
1- posting a "fastboot getvar all" (excluding IMEI and s/n)
2- what recovery you are running (name and version)
3- what does Windows Device Manager show (while in custom recovery) -> "Unknown Device" or "Android USB .. -> My HTC" (if it's the former then check my guide FAQ #2... disregard the guide only check the FAQ!!)