Spuradic - Lost Internet Connection

I have had fiber optics for about 6 months now. I had cable access before that. I have three computers set up in my home in three different locations. All three are hardwired to a linksys router. A few nights ago one of my roommates told me she lost her internet connection. I was on mine at the time playing STO and I was having no problems. I checked with my other roommate and her internet connection was fine also. So I went to the room where the connection was out and asked her if she changed anything, she said no. I restarted the computer, still the connection was out. I checked the cable where it was exposed from the wall it looked fine. Now I noticed that the desk was sitting on the cable, but it still looked fine. So I went and got my spare computer that I keep as a back-up and brought it to the room that was out. I connected it and turned it on and the spares internet connection was down also (I just had the internet running on the spare earlier that day).

So I figured it had to be the cable or router (linksys). So I took another spare cable I had and connected it to my spare computer and still got nothing. So I figured it was the router. So I took the cable from the computer I was playing STO on and connected it to the port on the router that was connected to the computer that lost the connection and my computer's internet came up just fine. I started changing cables on the router (using different ports and cables) between the two working computers and the one's not working. The one's that were working (one Win7, one WinXP) in the first place continued to work and the one's that weren't working (both running WinXP) continued not to work no matter what cables and ports I switched them in. It was late and I had to head to work early in the morning so I gave up for the evening...........