I have been using a Dell Inspiron 1545 for years at home. For Internet, I've always used the wired connection via cat5 cable to the router without issue, that is until recently. This morning, I seemed to not be able to make the connection. Since I am using a dual boot system, either Ubuntu or Win10 at startup, I decided to boot into Win 10 and experienced the same symptoms.
On Ubuntu 22.04, there is a question mark in place of the normal connection icon. On Win, no network connection.
I recently changed out the motherboard in the 1545 and for several days, the wired connection was working fine without issue.
To test if I could connect via WiFi, I enabled that in the laptop and the router. I normally use nothing but wired connections at home, so had to create and enable the connections for both items. The laptop connects to the Internet fine by Wifi with no issues.
What could be causing the unsuccessful wired connection?
Thanks in advance.