Post [Q]Htc one x unlock problem

hi, i have htc one x and a problem. my phone doesn't unlock when i press the unlock button, only the black screen, but buttons light working, when i restarted it the red screen comes out and i hear only boot sounds. after 10 minutes everything is good again. so i want to know is my phone is dead, or is it possible to still fix it? sorry for my bad English