If you didn't change the config register of the router and they are brand new, the default parameters for the console port are 9600 baud, 8 data bits, 1 stop bit, and no parity. Could you double check that the software you use to console the router is configured with this parameter?
If you have other Cisco router, can you check if you can connect with the same software and blue cable?
And you have an other blue RJ45 cable that may be worth trying it as well.
The following documentation explains how to apply correct settings for terminal:
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...