Okay, first let me start off by saying that I am not an expert in any sense of the word, so if the answer is obvious, don't flame me. Alright, I have an aluminum iMac and Comcast as my ISP. I use WiFi to connect to a Linksys WRT160N router. Now the problem. A few days ago, I noticed the internet on my iMac was really slow. After doing a speedtest through speedtest.net, I saw my connection was around 1,000-2,000 kps, much slower than my previous average of 15,000-20,000 kps. I thought maybe my ISP was just having a bad day, as Comcast normally does, so I waited a day to no avail. Then I noticed that my Macbook was getting around 17,000 kps, with no sign of a slowdown, even when it was right next to my iMac. Well, that eliminated range as a factor. I thought maybe something was wrong with my iMac, so I used a 25ft ethernet to connect to my router, and turned off the airport. Sure enough, I get 17,000 kps, but as soon as I turn the airport back on and disconnect the ethernet cable, I'm back to my 2,000 kps average. After turning to Google, I thought the DNS servers were my problem, so I tried both the OpenDNS servers as well as the 18.104.22.168-5, but that didn't seem to work. I did everything I could think of to diagnose and fix the problem, but after three days with no change in speed, I'm stumped, and I could use a little help.