If the screen doesn't light up or no bright white light, I would check a couple of things. First unplug the PSU from the wall and the Titan for a few minutes, turn on the PSU to see if problem is solved. If not, I would say it is either the RPi or the bridge board under the RPi is screwed. lightfoot will probably be able to explain this better. If it's the bridgeboard, I have a couple heavy duty ones for sale for .5 BTC each, I bought a few extra from a member here.