Hi Antonio,
Thanks for replied,
* 1- You did not install the server as a PDC (primary domain controller). This is a choice you need to make during installation.
I did this.

* 2- Your network adapter is not working. Check event viewer under administrative tools for possible error messages.
I've Checked on this too..

* 3- Your connection to the network fails. Check cables, hubs and protocols.
ditto

* 4- You are not logging into the correct domain (the domain where the PDC is located).
I'm not sure about this, but I just have only 1 domain.

* 5- Your user account does not have permission to enter the domain. Are you logging as administrator ?
I logged as administrator. I think administator can do anything on the server, isn't it ? (this is a true question, as I'm really a newbie on this NT OS)

* I suggest you to check all these issues and if you still got problems, reinstall the NOS and do not apply Service Pack 4 until you are sure you can enter the domain.
I'm going to try this, even without NT SP4 the OS won't recognize my display adapter.



Thanks.