I think, on a box small like rx2600 you do not have more than one interface, and for some reason it is not coming up. If there is no networking, your CDE will not start.
First, once you are at the root command prompt, you run
# ioscan -fnC lan
and see if you have any interface is coming back with NO_HW. If so, you have a hardware problem and you need to call in for hardware support.
But if the hardware is not your problem, at the command prompt, vi /etc/rc.log and search for word ERROR or FAIL in capital letters.
you will see the section where this problem gets reported. If you can copy the error text, and paste here, you will get better and more precise help.
More than likely it is a configuration issue, like wrong subnet mask or wrong route. Again, error message will get you better help.
Also you have asked few questions and got more than 10 answers. Please take some time to assign some points to these answers
Your questions missing points can be fout at:
http://forums1.itrc.hp.com/service/forums/pageList.do?userId=CA1274386&listType=unassigned&forumId=1A guide to how to assign points can be found at :
http://forums1.itrc.hp.com/service/forums/helptips.do?#28
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UNIX because I majored in cryptology...