My HTC One X was working perfectly fine but then suddenly the screen went black. I tried connecting it to the charger but the red charging light wouldn't come on. I also tried ringing the phone but nothing happened. I tried holding the power button for about 15 seconds, still no response. The final thing I tried was to connect it to the computer to see if the computer would detect the device however the computer didn't. I don't know what else to do, HELP?!?