I have the international HTC One X (tegra 3) and its unlocked. The bootloader is unlocked, but no custom rom. I'm running jellybean i thing 4.2 something. I put my phone on charge last night and it was charging and all was merry, (red led was on). And I wake up and phone is completely dead. Nothing wrong with the charger, it worked on my trusty ol HTC Desire. I tried forcing a power cycle, but no luck. Tried to boot into bootloader, with power and vol down, but no luck. I took out the sim, but no luck. My phone was part of the original or one of the earliest batches, the ones which have the faulty connection to the wifi antenna (so you have to press on the back of the phone to get any wifi connection.) Could it be possible that the connection to the battery has also become faulty. (Either from me pressing to much on the back or yesterday i had some thread from my jeans stuck in the 3.5 mm jack that i cleared with a small pin, and I accidentally unplugged or broke something). TL;DR, My phone wont start, no power cycles, no charge, no bootloader. My carrier is o2 but that is irrelevant.