Smart Switch 2724

I know that this is an older switch but it works (or did).

I had a switch take a dive yesterday. I hastily configured another one and this time I installed it with a public IP in the public network range so that I can shut a port down if I feel there is a server being attacked. It is working very slowly. The switch is also throwing HTML on my screen - I can see the code for the switch. Additionally all ports say that they are set for 1000Mbps. but I only set them for 100. The switch is now showing auto-negotiation sometimes disabled, sometimes not. I plugged into the Link port (port 1) and instantly had throughput that while at the data center was great. Very slow. 603377 collisions and climbing. Previously I had plugged into port 24 with no external access. It was still set to 192.168.2.1. I don't know why I would suddenly have colisions on a network that has been running for 10 years. But I'm not a hardware guy.