General :: DHCP Is Not Starting Keep Failing In Centos Os 5.5

I have Dell rack server. With the network card of five network ports. But I am just using first one (eth0).

Now the problem:

Its connected the internet and the internet is working fine. I also got update using yum.

When I do ifconfig to check its dynamic IP. It also shows the IP(something like: 192.168.x.x), but if I go to services and try to start DHCPd service its fails. Its not starting at all. And If I go to other computer (Windows 7) and try to ping the dell servers IP, I cannot ping it. So since I cannot ping it from other computer, so no one we can have remote access to the dell server.

I dont understand without starting DHCPd how the dell server is getting the IP address.

So I thought maybe DHCP is corrupted so I removed it using yum and reinstalled it using yum, but no luck so far.