Issues assigning IP to Mac address with BOOTP/DHCP Server.

I had a 1794 AENT ethernet adapter card go bad. Tried to replace and cannot seem to get the replacement to work. I've tried everything I could think of with no results. The most concerning is that I plug everything in, 999 on the dippers, open the server and my MAC address doesn't show up in my Request History. I've tried a few different combinations trying to get it to show up and nothing. I try adding it in manually and I get a Socket Connect error message. I cannot seem to get it to work and is frustrating to say the least. Any help into a step by step process of how this is done successfully would be awesome!!