I was watching Netflix when my phone randomly rebooted. Its been randomly rebooting since the 2.3.5 update, but ignored it. Now when i turn on the phone it shows the lockscreen and then the screens turns off(with tv animation). And wont turn on!
Did you try holding down the volume up button on the side, then pressing the power button? It will take you to Recovery and from there try restarting your phone. Go up/down with the volume keys and make a selection with the power button.