Hi,
I've got exactly the same symptoms as the first post in this thread. My HTC One X is completely dead. Happened ramdomly, no water damage, no drops, no mods completely stock. It started doing it intermittently and would eventually come back on once fully charged but then it just died. Tried all the different combinations of holding buttons down for 2 minutes, 10 minutes etc, nothing, no flashing lights, no bottom screen, no LEDs when charging.
I read somewhere that the batteries don't like being too low so I've put a new battery in. Still nothing.
When I plug it into a PC it makes a sound as if a new device has been plugged in then straight away makes an error sound. When I hold down different buttons it makes these sounds about every 5 second continuously.
Jess's solution hasn't worked.
Think it might need a new motherboard as another poster said.
Any thoughts?