DHCP serving has stopped working

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http://serverfault.com – Something happened in our server room over the weekend that had me in the office late Saturday night replacing two switches. After powering down both racks, I have an issue where none of the computers that use DHCP are getting the settings required for our network. If they are set to static, everything works fine. So I think the issue is with the DHCP server. We have a Juniper Netscreen NS-50 hardware firewall/router that does the DHCP serving. It is supposed to hand out an address in the range, it's private IP as the gateway and a Windows Server box's IP for the primary DNS. I (HowTos)