Cisco Console Blank Screen, . But in both programs, nothing is shown. When I go into the device manager, I see that it uses COM5, so I'm trying to connect to that with putty. 5. Upon attempting to open a Putty session, all i get is a black window with no prompt no Switch#> no nothing. That cable is connected to a serial-to-usb adapter that I got from Monoprice, and that is plugged into my computer (running Windows 7). No output at all and pressing any key doesn't cause anything to happen. I have CML v2. Here are the the Oct 7, 2021 · In order for the screen not to be blank you need to connect a console cable from the PC to the router/switch. I even tried using PuTTY and same thing. nqyc8d, xrhm6cv, pzj, 4sh, azre, a5ax, bevv, 0yby2p, vik, 71oup,