Two days ago everything was humming along just fine when a power outage knocked the whole building out. After a few hours everything came back up and all the servers seemed to be operating correctly. Existing users and computer are connecting and accessing everything fine. However, any new devices, printers, computers, mobile devices, will not pull an ip in the range specified in the scope. This is a fairly simple network layout with one switch connected behind a SonicWall. My DC is a Windows 2003 R2 and serves as the DHCP server as well. It is a 10.10 scope, however the new devices are pulling 192.168 addresses. I can't seem to pinpoint where the problem is. The wireless devices are connecting through a Linksys WAP54G AP. The AP pulls the right IP address as before but anything connecting wirelessly through it also pull these 192.168 addresses. Any suggestions on what to look at that would be causing this?

Check with a ipconfig /all on a problem computer, dhcp server will be listed. Connect to it and check what is the gear that give the IP (look like a router that serve as an accesspoint fallback to it's default setting) MCP | MCTS 70-236: Exchange Server 2007, Configuring

Someone may have connected a home internet router into their office to use as a switch and did not disable the DHCP service. This is pretty common. If you have managed switches....You may want to follow up on an affected computer, ipconfig /all as yagmoth555 indicated, ping that DHCP server IP, look at the MAC addresss in the arp table (arp -a), locate the port where that MAC shows in the logs, follow the cable to the offending DHCP device. Guides and tutorials, visit ITGeared.com.

192.168 should be the range of the Linksys Access point. Could you brief your network setup?