Line console issue

I was working on cisco 1841 router and suddenly I can't have output from the line con 0 on my monitor , I had connection to the router with telnet and ssh
but I've erased the config thinking that it would solve the problem but insted I'm locked out the device I can have access to another device with the same console connection so the cables won't be the problem, the only thing that shows me when the router reboot and when an interface change the status 

I'm using putty but I've tried hyper terminal and it's the same
from the 4 devices that have that issue I can access one device so I did show line con 0 to see where in the
difference and the output was the following
SW1#sh line con 0
      Tty   Typ     Tx/Rx    A   Modem  Roty   AccO  AccI   Uses   Noise  Overruns   Int
*      0    CTY                 -       -          -           -        -          2       6          0/0         -
SW2#sh line con 0
    Tty    Typ     Tx/Rx     A   Modem  Roty   AccO  AccI   Uses   Noise  Overruns   Int
*    0     CTY                  -        -          -         -          -         0       1          0/0         -
SW1 is the device with the line con problem
SW2 is working just fine

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