I have a computer hooked up to a cable modem, and I was able to get online at first with no problems, but a couple days ago, it began to tell me that the network cable was unplugged. It switches every few seconds between thinking that the cable is and isn't plugged in. That connection works fine with another computer and the computer works fine on another connection, so I don't know what it could be. The repair option doesn't work, b/c it isn't telling me I have limited or no connectivity; it is telling me there is no cable plugged in. I am using a new cat 5e cable and have tries cat 6, but that doesn't seem to be the problem either. If all the components work individually on other setups, why don't they work with this particular one? HELP!!!
211695
Sounds like you have a bad NIC in your PC.  If the modem works with other computers, its probably OK.  Sounds like you tested cables well.  \nDo you have more than one device hooked up to the modem?  if so, certain models may require a router in between.  \nWe did even talk about your networking settings at all.  Enable DHCP in your modem.   Set PC to Dynamic IP.\nIf all doesnt work, purchase a new ethernet card for your PC, install it, and if it still doesnt work, take the ethernet card back to best buy for a refund.  Its all good baby.
347650
Check the modem to see if there are still any DHCP address left for it to hand out. Check if the DHCP server can hand out IP addresses to the wired computers, not just to the wireless computers.\nCheck if you can have both a wireless and a wired connection at the same time (some modems will only allow one type of connection). Check if your network card is installed properly. Check if the cable is still good, swap it with a different cable if you can.
511525
check you ethernet cable.  It is like a large phone line running to the back of your computer.  Make sure it is plugged in on both ends.  Also try unplugging and replugging your cable/dsl modem or router
496969
Actually, the normal behavior of a cable modem is to always stay on even if the computer turns off. There is no reason to turn off the cable modem when you turn off the computer.
642936
try to reset it and if that doesnt work just try to go to control panel and network connections, then right click your service provider and click repair....that should work@!!
260715
Try turning off the baby monitor. Then turn off power to all of the appliances in your network (PC, modem, and router). Then turn on power to all of the network appliances and turn on your computer. If you are able to surf the net without a problem then it is the monitor. If it still doesn't work, then plug the modem directly in to your tower (without the router) to see if you can surf. The baby monitor should have nothing to do with your cable tv though as that the two are not related. You should find the problem by completing the above troubleshooting though.
188460
If you still know which cable was plugged into your computer locate it. Then figure out your wireless network settings in the wireless config part of the control panel. Do you have a wireless card installed, and a wireless router. If don't you are out of luck but if you do you should be able to see the technical information on your wireless device in the system part of control panel. Then look at your network settings and see if networks are registering. If so choose one and click connect. Your last resort if that does not work is either call the guy that installed the system and ask him for help or call the owners of the devices that you are trying to use.
393562
Go to network connections and disable your current connection then create  a new connection.Since this is a new connection everything should be fine.\n\nIf you don't know how to do that kreaturekodeyellow@yahoo.com\nfor an instruction guide.\n\nGood Luck!
31360
U said - \n"Plugging the cable modem straight into a computer may work at times, but it may not."\n\nAll the rtr does is pass on the internet conection to a computer(s).If ur connection from comp itself is not working well,BEFW11S4(which is ok)is not to blame.Cable modems need to be power cycled a lot of times.\nSo i wud suggest that the moment u dont get a connection ,immediatel connect the mdm to comp and call comcast,who wud be bound to do sumthing abt then (as the rtr is not involved now)\n\nOR\nif u feel that the rtr's not working properly,,just call Linksys and get them update the firmware(they'l guide u thru it).Also u can insist on getting it replaced,on the grounds of it not working,but u gotto be adamant and make the call longer than 40 minutes.\nP.S. : yeah befw11s4 is an old rtr,,get a wrt54gsx,if possible
590744
I'm gonna take a shot on this and say it is an encryption issue. Both sides of the connection (the router and your computer) must be enabled with identical encryption code. If they are NOT the same, they will not connect. Also, look into changing channels. This can be the culprit as well.\nSetup one computer at a time and then move on to the next one.\n\nHope this helps!
99242
Manually restart your modem if its an external modem and if it's an internal modem then switch off your pc and remove you modem from your pc for 5 to 10 min & then put it back in your pc and then restart the machine...and this will work... as this works 4 me
499787
My guess is that your modem only allows one method of connection - either USB or ethernet, not both.  You say in your question wireless router, do you have 4 ports + the one internet port on the back, or just 1 port?  If you only have one, then it is just a wireless access point.  If it is a wireless router, you would be better off placing the modem in bridged mode and running everything through the router.  However, in one of your updates, you mention that "the broadband controller has some problem" - do you mean the network connection on your computer?  You might try reinstalling the drivers and see if that takes care of the issue.
330933
What you need to do, is turn off the windows Firewall temporarily and see if connectivity comes back after a restart. If it does, then try turning it back on the computer should work fine. If that does not happen, then you need to run the Networking wizard again. And Make sure you chose the right options..... right internet connection right computer configuration. This should solve your problem. Also turn off and then back on your Router/Hub or USB Cable for Modem.
127816
Let's take this one step at a time starting with the Modem/Router issue.  When you connect the modem to the router you are using an RJ45 connection?  This should allow the router to connect to your ISP.\n\nNext you should be connecting your computer to the router, either wired or wireless.  I would start out wired with another RJ45 connection.\n\nYou said "I have been trying to set up one of my computers as a server"; what did you want this computer to do as a server?  Is this suppose to provide your intranet with IP information, DNS, sign on authentication, or are you planning it to host your web set to the world?  Each of these is a different function and do not effect your connecting the router and modem to the Internet.
485033
Dont let your ISP BS you! I have seen many a case where there was an intemittant connection in cable lines as well as phone lines! If you are sure it aint on your end, tell them either to fix it or you will look for another provider.
251280
You need to reinstall the the modem software so that the os can detect the modem. If that doesnt work then you can try unplugging your modem and plugging it again after restarting the system. Get back to me if that doesnt solve your problem
645206
Could you have blown the fuse in your plug?  Replace the fuses in both the computer and monitor plugs.  It is possible to buy a plug that prevents power surges reaching your computer.  \n\nYou may be concentrating too much on the coincidence that the warranty ran out at the same time as the problem started.  \n\nYou may have caught a virus and need to use your anti-virus recovery disc. \n\nYou may need to use your Windows recovery disc. \n\nAs everyone has mentioned already we need more info.