Very Computer

1. 'lo' & 'eth0' devices inactive: how come ?

Hi here,
Could someone PLEASE tell me why my 2 devices lo & eth0 are inactive
in the Network Manager ?? I'd just like to know where I can find
the line that should bring them up when Linux boots on my PC (I have
Red Hat 5.2 distrib.). In which file should I find this line in
Red Hat ??

If I do 'ifconfig' I get no output, if I try 'ftp 0' or 'ping
myMachine' it fails as well. What amazes me is that I have 2 PC's,
and one works fine: and I can't seem to be able to find out what is
wrong on the PC that fails (from the configuration point of view).

Thanks a lot for any help !!
Regards,
Seb

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