What are the best practices to troubleshoot a network connection issue?

I have a user with Windows 7 SP1 Pro.

The PC was working fine, but then all of the sudden it stopped connecting to the network.
The network card was changed, I tried connecting the user to another network port with a different cable but nothing, no network connection whatsoever.

So, it looks like it could be a software issue.

What are the best practices to troubleshoot a network connection issue?
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Seth SimmonsSr. Systems AdministratorCommented:
The network card was changed...

are the drivers installed?
does the interface appear in the adapters list in network connections?
are there flashing lights on the interface where it's plugged in?
does the interface have an IP address?
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