Phone trouble, techies help?

Okay so I have an HTC One V phone from Virgin Mobile. I’ve had it since about August and it’s an utter piece of junk, it acts up all the time. Today it popped up that a software update was available for it. I installed it, and my phone restarted itself. And kept restarting. It has been stuck on the “HTC quietly brilliant” screen all day. It recently ran out of charge and turned off. I plugged it back in only for the screen to return. I can’t turn the screen off, nor can I get the phone to do anything else. I’ve tried holding down the power button to restart it, but it does the little virgin mobile video clip and then back to the bootup screen.

Help, please?!