Cannot switch between PC's

I have 3 PC's connect to this 4-port that I just installed out of the box. I only get one connection(and one light lit up). Which ever PC is connected to port 1 gets control. I cannot use the button on the front, the scroll scroll up or down or number keys, and it will not auto scan. I assume it only sees one PC connected as it only gives me one light lit up (port 1). I can connect any PC up to any port and get power, but the light only shows that it is on on port 1 and I only have mouse, keyboard and vga on port 1. I have tried shutting down all 3 PC's and bringing each one of them up one at a time but get the same result. I had a 2-port belkin kvm connect and that worked fine but since I have dropped a 3rd PC I needed a 4-port. Any help would be greatly appreciated. FYI I have (2) Win server 2003 machines connected and a Win 98 machine. Thanks in advance Matt I do have the same problem cannot switch between PC's. It was working before but some how when using the ibm reflection i hit some keys to clear the ibm session then i was not able to switch between PC's. Im using Extron Electronics Extron SW VGA/Ars series with 4 minitors. Thank you for your support