Modem disconnects when pc is turned on

[Elementgreen]

Haven't had any connection issues until now, but, whenever my pc (the only pc in my apartment) is turned on, my modem disconnects and will not reconnect until it is shut off. My pc is connected to a wireless n-series router. Any help would be greatly appreciated.

 

[Saga Lout]

How is the MODEM connected to the PC? Does it share a power connection at the wall?