htc replaced my mainboard for free with unlocked bootloader

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http://forum.xda-developers.com – after unlocking my one x , i installed arhd and it worked good for 2 days then when i trired to pull down notfication tray the phone hangs and showed missed graphic elements on the upper half of the screen then i restart the phone by holding the power button but it remains the same during the boot also so i restarted into boot loader and it went fine so i choosed recovery but it stuck at the logo of the recovery so again i restarted the phone but now it's not responding at all and the screen is black so i tried to connect the charger but no response at all and the phone is dead after one (HowTos)