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Greetings - I think you're not clear about how using the Internet works (not many people are - especially starting out).
The modem and the LAN card are TWO DIFFERENT ways of connecting to the Internet. The modem uses a regular phone line and the LAN card uses Ethernet (a different faster way of connecting to the Internet in which needs further hardware such as a cable or DSL modem from your ISP).
Or is it possible you're talking about connecting your LAN card to your cable or DSL modem?
If this is confusing to you please call the tech support of your Internet service provider and they should be able to walk you through getting connected..
In the control panel network setting, connect using 'connect to a workplace'. Ofcourse with a LAN cable, insert one end of the cable to the pc as well as the other to the router. Put in the usual parameters.
Unplugging the wireless router and connecting it again should not have altered the wireless connection/configuration. You have connected the cables correctly because the Internet works when you connect a LAN cable to the router.
The Linksys wireless configuration or the wireless card configuration in the computer was changed it to lose the wireless connection. The wireless card configuration needs to be changed to match the wireless router's settings or change the Linksys with new configuration settings and configure the wireless card accordingly.
To secure your router with a login password and wireless security, please follow my instructions - click on this link :- http://www.fixya.com/support/r3559128-wireless_router_security
Should you need further assistance, please leave me a comment.
If you are connecting to the Internet using a wireless connection and your LAN card in the computer does not have a LAN cable connecting it to a hub or router then you will get a message "A network cable is unplugged".
If you don't use a wireless connection and you only connect to the your network/Internet then the problem is either the LAN cable has come loose in the computer's LAN card or at the router or the LAN cable is faulty.
Check if the LAN cables are connected properly, make sure that client PC's have handycafe client installed and connected to the hub/switch with the server PC.
In some cases wherein the server has two LAN Cards installed, make sure to choose the LAN Card which is connected to the hub/switch where the client PC's are also connected during the initial start-up of the Handycafe software.
Note: Check if the hub/switch or router (whichever you're using) does not have a problem.
Have you tried going into the bios setup before windows loads up? You may have a setting to choose startup on lan. Just turn that off and hit F10 and enter. To enter the bios setup keep pressing delete after truning on the computer until the bios screen appears. Don`t change anything unless you know what you are doing.
Most laptop lan ports are onboard so replacement would mean replacement of the entire Motherboard. A very costly option. I suggest buying a USB to NIC adapter from your local PC store and just use that for LAN connections.
(side note: get a good brand, cheap USB to NIC/LAN converters sometimes drop connections randomly so spend a few extra $$$ for a good one)
The LAN pc card on you laptop is not recognizing the connection to the router that's why you are getting an erro saying cable is unpluggged. Try to user a different ethernet cable or try the laptop to the modem check if you will still get the same error so that we'll know if its a fault with the lan card or if it's just with the cable.