[CentOS] Bringing up interface eth0:

I'm installing CentOS 4.4 64-bit Enterprise on  a Dell Dimension with 
and AMD dual core 3800+.  When it starts to load eth0 it hangs. I have 
not found a way to break out of it. Or how to boot at run level 0. So 
newby Question 1 how do I get it to boot without loading eth0 so I can 
make changes? Question 2 what is a likely problem and fix. Question 3 
what is good documentation and other resource to find answers for sys 
admin questions.

Thanks,
Russ