I have Trouble Connecting To WiFi Network with My Mac, while the rest of the technology connects to it perfectly...

I have used my Mac for almost a year now, and I've always had no problem connecting to WiFi, but today - suddenly I've lost the connection and now I can't see the WiFi Network in the list... I have 2 WiFi's connected together at home - TP Link and Netgear...
The internet still works on a PC which is connected through Ethernet, and the Mac itself works when it's connected through Ethernet... The first thought I had was the problem with WiFi settings, but my IPhone can connect to internet and work perfectly... So next thought was that it was a problem with my mac, but my dad has the same problem with his Mac (he also used this WiFi Network fine before)... So any thoughts?

Hi there,
You may want to take a look at the troubleshootings steps found in the article below.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
-Griff W.

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Trouble extending my WiFi network with older Airport Express

Hi,
As the question states, I have an older Airport Express which I have dug out to try and extend my WiFi network in a new house.
I am on Virgin Media (fibre optic) in the UK and get a good WiFi service but one room in the house (which I have just turned into a cinema/media suite) has no reception.
I have successfully managed to 'create a new network' via the Airport Express and the signal strength is 100% but for some reason if I try to reconfigure the device to extend the existing network I get no improvement at all from the (zero) signal I was receiving before.
Am I doing something wrong? Or is there an additional step I am missing?
I could live with having a secondary network but what I would really like to achieve is Home Sharing from my main computer, so that I can access my photos, movies and music etc. from iTunes on the big screen. If the computer exists on another network my iPad, iPhone and AppleTV can't see/use the media from that room.
Many thanks in advance,
Colin

Are these the steps you used?
To create a wireless extended network, you must place any extended Wi-Fi base stations within range of the primary Wi-Fi base station.
Start with the device that will be configured as the primary Wi-Fi base station. Then configure your extended Wi-Fi base stations, ensuring that each is within direct range of the primary Wi-Fi base station.The physical location of extended Wi-Fi base stations will vary according to the building environment and may require some experimentation.
If you have configured your Wi-Fi base stations in the past, it may be helpful to do a factory default reset of each Wi-Fi base station that will be part of the wireless extended network before you begin.
Configuring the primary Wi-Fi base station
Power on all 802.11n Wi-Fi base stations and allow them time to appear in the AirPort Menu Extra.
Open AirPort Utility (On a Mac, choose Go > Applications from your desktop, click the Utilities folder, then open AirPort Utility. In Microsoft Windows, choose Start > All Programs > AirPort to start AirPort Utility).
Select the primary Wi-Fi base station in the Base Station Chooser, then click Continue. Note: If you see a message appear that indicates that the Wi-Fi base station has been reset, click Cancel to continue.
Click Manual Setup. Enter the base station password if necessary.
Click AirPort in the toolbar.
Click Wireless.
Choose “Create a wireless network” from the Wireless Mode menu.
Select the “Allow this network to be extended” checkbox.
Enter a Wireless Network Name.
Optional: By default, Wireless Security is set to None so that no password will be required to join the network. We recommend you click on the Wireless Security menu, select WPA2 Personal, and create a password between 8 and 63 characters long.
From the Radio Channel Selection menu, select Automatic.
Click Update.
The next window may indicate that there are some problems. Resolve the problems, then click Update.
You are now ready to add extended Wi-Fi base stations to your network.
Configuring an extended Wi-Fi base station
Place any extended Wi-Fi base stations within range of the primary Wi-Fi base station
Ensure that all 802.11n Wi-Fi base stations are powered on and allow them time to appear in the AirPort Menu Extra
Open AirPort Utility (On a Mac, choose Go > Applications from your desktop, click the Utilities folder, then open AirPort Utility. In Microsoft Windows, choose Start > All Programs > AirPort to start AirPort Utility).
Select the Extended Wi-Fi base station in the Base Station Chooser, then click Continue. Note: If you see a message appear that indicates that the Wi-Fi base station has been reset, click Cancel to continue.
Click Manual Setup. Enter the base station password if necessary.
Click AirPort in the toolbar.
Click Wireless.
Choose “Extend a wireless network” from the Wireless Mode menu.
Choose the network you want to extend from the Network Name menu.
Enter the network and device password if necessary, then click Update.
The next window may indicate that there are some problems. Resolve the problems, then click Update.

Trouble extending a wifi network with 2nd Airport Extreme base station.

I have added a second Airport Extreme in order to extend a network. I connected it to the network via an ethernet cable into one of the three ethernet ports. I have configured it using these instructions (http://systemsboy.com/2009/02/extending-an-airport-network.html). I get green lights for both units.
My network works until I update the second unit. As soon as I update the second unit, my entire internet connection goes down. Even computers in the office that are connected via ethernet cannot access the internet. As soon as I unplug the second base station, the internet connection is "live" again. I don't know how to proceed. I think my brain is fried. Any advice would be helpful.
Thanks,
Rich

Based on the information in your post, the article that you referenced will not provide the correct configuration that you need for your network. In summary, the information in the article is for extending wireless network using wireless only. You are connecting your two routers together using ethernet, correct?
To confirm, your post indicates that +I have added a second Airport Extreme in order to extend a network. I connected it to the network via an ethernet cable into one of the three ethernet ports+
If this is correct, the Wireless Mode for your "main" router should be set to "Create a wireless network".
For the second AirPort Extreme, you will use exactly the same setting, "Create a wireless network". The network name, security and password should match the settings of your main network exactly. This is probably confusing to you, but these are the correct settings when you have the second AirPort Extreme connected to the first using an ethernet cable.
It is critical that the second AirPort Extreme be configured as a "bridge" in order to function correctly on your network. When you are in AirPort Utility - Manual Setup, click the Internet icon at the top of the setup page. Look for the Connection Sharing setting at the bottom of the page. This must be set to "Off (Bridge Mode)". The configuration to "bridge" should be the last step before your click the Update button at the lower right of your screen.
Post back if you need more information or details.

HT2421 If I attach a hard drive to the USB port, can I access it from the wired network, while simultaneously creating a separate wifi network with NO access to the hard drive?

I already have a wireless network (call it Network A) with connectivity to various wired and wireless devices. I have a USB hard drive that I directly attach to my MacBook Air. I use it for Time Machine backups and general storage. I would like to move this drive to an AirPort Extreme. I would like to continue to be able to reach it via Network A, but also use the AirPort to create a guest Network (Network B). I don't want the guest network to access the hard drive.
Now, I know I can plug a hub into the USB port and put (I hear up to 3) hard drives on it. Can I determine which ones are accessable by Network A, and by Network B?
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You cannot create a wireless network for guests if the AE is bridged. It has to be the main router in the network.
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If you can create a guest network.. and you can overcome the limitations of airdisks.. then any person on the guest network should not be able to access the disk drive.. but if you wish to go ahead Bob Timmons might be able to confirm it.. I stay away from USB drives on routers.. I do not and will not use a router as a NAS.. it is underpowered and simply unsuitable long term.. a cheap single disk NAS is many times faster.. more reliable.. and has a marvellous thing called backup.. no USB disk or even internal disk in a TC can back itself up. .nor can TM backup network drives.. so any data you store on a USB drive is going to be gone one day.. unless you go to great lengths to back it up .. to where.. another USB drive plugged into another router somewhere.. the definition of slow.. should be copying files between two usb drives in an apple network using wireless. You will experience new levels of pain and suffering.. likened to the belly of the Sarlacc.

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I also want to have the option of streaming from my iPhone.
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i have trouble connecting my ipod touch 3G to my Wifi hat home. we are using a WEP3 key, but i can't find a way to tell my ipod to use that.
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I have Trouble Connecting To WiFi Network with My Mac, while the rest of the technology connects to it perfectly...

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