Network Adaptor conundrums

[Petrus de Calguarium]

John Aldrich wrote:

> Just wondering, but what have you got against system-config-network?

About system-config-network...

Yes, of course I examined it right after rebooting with the new motherboard 
and not having any internet. So, I will tell you what I see, now that I do 
have internet (but I have to click the applet to get it to start): in the 
devices tab, I have my eth0 device, enabled, status active (I didn't click 
'activate when computer starts', as I believe you were suggesting, and I am 
staying with DHCP); in hardware, my eth0 adaptor is correctly shown. All 
seems well here, as far as is possible to ascertain.

What is curious, however, is that that other program, network device control, 
is completely blank. According to it, there are no network interfaces 
configured in the active profile! This seems odd, as I could swear that there 
was a device here before I swapped motherboards/ethernet adaptors. The 
program has no way for me to enter anything: I cannot activate, deactivate or 
configure what is not there!

Does this suggest something, like why networkmanager applet is not connecting 
automatically without me expressly clicking to activate?