Having a problem adding a new card in the 200 cabinet. When I add the ivc 24r card and power it back up it locks up the system. The phone displays won't come on. Tried two different cards with same effect. Tried different slots, even programmed the slot then added the card and powered it up. No luck. The light on the card either flashes fast or sometimes stays solid red. System is licensed for 60 remote ip phones. Any ideas?