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You will need to make sure your wireless card is turned on.
Click on the Apple logo in the top left and select System Preferences.
Select the Network icon.
In the left-hand column, select AirPort.
Make sure the status says "On," if it doesn't, click Turn Airport On.
Select your wireless network from the "Network Name" drop down menu.
You may need to enter a password if you have one set up.
Your Mac should now be connected to the internet.
This assumes you have a working wireless network set up already.
The antennas in the Macbook Pros have had an issue with reception due to the aluminum housing of the laptop but, should still receive decent reception just not as much as a plastic Macbook or plastic PC laptop. It could be possible that the antenna's cables have become disconnected from the Airport Extreme card inside your Macbook Pro, that the card itself is faulty or damaged or that the Antennas themselves have been damaged in some way. As always make sure you have the latest updates and have installed any driver updates from Apple regarding your Airport Extreme card. Here's an article that may help eliminate any wireless interference that may be affecting your signal strength. Apple - Wireless Interference hope this helps, if so don't forget to comment, vote, etc. Thank you.
Open your airport utility (Applications/Utilities/Airport Utility). See if anything comes up on the left. If not, reset your airport and network. Also, in System Preferences, click Network. See what it shows for airport, and delete your current network, and set up a new one. Do you have bars on your airport on the tool bar?
Basically Time capsule is same as Airport extreme base station added with a hard drive to take wireless backup.Put same Network Name and password in both Time capsule and airport base station.Suppose your are making TC as a primary base station and Airport extreme as a secondary base station. Select WDS in both the base stations .In "Wireless Mode" select"Participate in WDS network" in both the base stations.Dont change rest of the options.Put TC Mac id to Extreme base station and extreme Mac ID to TC.now open the airport option in your laptop and check.you can see a single network name.Its DONE.Njoy using wireless
Sounds like the airport card got turned off. In the upper right area your your screen you will see a triangle shape made of curved lines. This is the airport symbol. Click it, and make sure that its on. If it is off, you will have an option to "turn airport on". Turn it on.
If it is on, make sure you are connected to the correct network. If you try to connect to a secure network with the wrong key, it wont work. If none of this works, let me know and we will get in to the complicated stuff :D
You need to check your network card software your problem may lay there. I've seen this problem many times in the passed. I will install a wireless network card or software on someones computer and two days later it will not connect everything looks fine. No matter what I do it will not connect. Remove net software for the card or on board wireless reinstall and boom it works fine.
routers may need reset or configured off the internet or the start up cd. I take this a wireless router hooked to internet gateway. don't know not enough information you may need to tell me a little more. first try install of net-card software then set you working router to unsecure no pass word need see if you connect then change it to you wpa password protected.
You may need to access the network with the ASCII password. Is there a system administrator you can contact to get this code? It will be a very long string of characters and replaces the typical password you seen in many Airport type setups.
you should try a software update first along with a PRAM and SMC update (hold the power button down when the computer is off for 15 seconds-it will beep. immediately after that hold down the Apple, option, P and R keys simultaneously until the computer reboots and chimes 3 times)