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Start at the lowest level. Do you get a link light on the switch and the card?
Go to a shell as root, do a:
tail -f /var/log/messages
Pull the network cable. Wait 15 seconds, then replace it. Do you see any messages pertaining to link up or down? Ctrl-C to bail out of the tail.
hosts.deny/allow won't affect ICMP (ping).
Do:
iptables -F
iptables -F -t nat
iptables -X
to make sure that all of the possible iptables rules are gone. The iptables service is really just a script that runs at start up to set the rules.
do:
ifconfig -a
and
netstat -nr
and post the results.
If eth0 doesn't show up in the output, Linux isn't finding your card.
The output should tell you what interfaces are up, and their IP if they have one.
Are you running DHCP or static addressing?
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