Q:

How to tell if I'm using a Server Dell PowerEdge 2900 I or II?

How to find out the exact version of this old server? 
It doesn't seem to be any mark or number printed on it (I was looking for a roman numeral).
Thanks

A:

The service tag is listed in the server's BIOS setup and is likely echoed to the screen during boot. 
Additionally, you can get this info by installing OMSA on the system. 

