Let's see your syslog files. If your DHCP client can't get an IP it will throw an error that will show up in the logs. What version of OpenBSD? What DHCP client? Generally, the quality of the answer reflects the quality of the question. BE SPECIFIC OR YOU'LL GET NO ANSWERS.

And by the way, OpenBSD is Unix so this is the right forum for this post. Technically Linux is not Unix but that's another arguement.