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I tried connecting a simple stepper motor. There is no rotor movement at all. Most likely, the problem remains in the board itself. Since the board has already worked before and I understand how it should function, the issue is not in the software part. The question is very important for me — is it possible to connect the extension boards you suggested not through the Mesa board’s P2 expansion port, but through its TB4? Because most likely, any extension board connected through the faulty P2 port will produce the same result.

In the Pncconf wizard? yes I changed it to 10.10.10.10
ip a returns
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host noprefixroute
valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 90:b1:1c:8d:36:5f brd ff:ff:ff:ff:ff:ff
altname enp0s25
altname enx90b11c8d365f
inet 10.10.10.11/8 brd 10.255.255.255 scope global noprefixroute eno1
valid_lft forever preferred_lft forever
inet6 fe80::147c:8a67:beeb:e22a/64 scope link noprefixroute
valid_lft forever preferred_lft forever

What does
ip a
in a terminal return?
Also, did you set the IP to 10.10.10.10 in the wizard? By default it is at 192.168.1.121

if you get CR7 (/DONE) illuminated at any time after initial power on,
you likely have a marginal 5V supply. (CR7 is only illuminated during a
power on reset)

let me start by saying Hi and I am very new to linux and linuxcnc.
I've been trying to 2 days to get mesa mesa 7i96s to connect to linuxcnc. 
I am running debian 13 Xfce and I have kernel-vers -v: #1 SMP PREEMPT_RT Debian 6.12.48-1 (2025-09-20)
I have wired connection 1 Ipv4 set to manual and address set to 10.10.10.11 (routes set to use this connection only for resources on its network)
On the 7i96s I have the jumper set for eeprom. 
I can ping the card at 10.10.10.10 and it appears to respond (yellow power led and green users leds lit)

but when I to launch my config file I get red led's on cr6 and cr7
and linuxcnc shuts down and gives this debugging 

Note: Using POSIX realtime
hm2_eth: rtapi_app_main: Resource temporarily unavailable (-11)
./7i96s.hal:9: waitpid failed /usr/bin/rtapi_app hm2_eth
./7i96s.hal:9: /usr/bin/rtapi_app exited without becoming ready
./7i96s.hal:9: insmod for hm2_eth failed, returned -1
1868
Stopping realtime threads
Unloading hal components
Note: Using POSIX realtime

I am not sure what I am missing...