no dial tone could be a number of things, one is when the control card is pushed into the power supply it does not seat well so I would hold the power supply while pushing in the control card, you may want to try reseating it. The no dial tone could also be cabling or a card. To prove this is if you have two line cards frog or swap them and see if the trouble moves, you could also do this with the cable that connects to the line card to see if that is it. These procedures should isolate your trouble.