My friend and I are troubleshooting our internet connection with a guy from the cable company whose from that company's internet repair dept? He told us to connect our pc(it's Window xp) directly to the modem via ethrnet cable and unplug the power from the modem. After a few minute, he told us to plug it back and later the light stop blinking on the modem and they were steady. He told us that we can turn our pc on. And, try to open to websites. The browser didn't display the page from that site just like before we call the guy from the internet repair. He told us that the modem is ok. since, its a Ambit modem sync and ready is steady. He told us to use run then type in "cmd". On the command, I type in "ipconfig". and, it show to mdeia status : disconnected and on the second paragraph ,watsoever, under local area connection our ip address is 192.168.... I forgot the other numbers. What does ipconfig do? The guy from cable company said that it's not a valid ip address because it's not from the network and our modem is working. and, told my friend to contact his pc manufacturer. what should we do now? we assemble this pc, it's AMD x2 1.9GHz, we still have all the driver and widows cd. 
