Check your ifcfg-eth0 file and make sure the interface is set to come up on boot. It might be down by default. If it is, "ifconfig eth0 up" should bring it up.
If it IS set to come up on boot, and its still not getting any DHCP info, make sure you're DHCP server (probably a broadband router) is working properly.
If none of that works, manually assign an address and manually bring up the interface, and see if that helps.
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