Laptop not connecting to wi-fi

My Macbook has developed a fault in its ability to pick up wi-fi networks. It was fine for the first couple of years. Now, when I scan for networks, it often registers them only weakly (on the "bars" icon - menu bar) and sometimes not at all. It often times out joining networks because the signal is so weak. I know the network exists and is "broadcasting" strongly enough because my iPad picks it up and joins it happily. Sometimes re-starting the computer solves this problem, but only temporarily, and this is unreliable. If I sit right next to the router, it is *mostly* OK, but this is hurting my back. Can anyone suggest what's wrong?

Does the iOS devices connect to other networks?
Does the iOS devices see the network?
Any error messages?
Do other devices now connect?
Did the iOS device connect before?
Try the following to rule out a software problem:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Power off and then back on the router
- Reset network settings: Settings>General>Reset>Reset Network Settings
- iOS: Troubleshooting Wi-Fi networks and connections
- Wi-Fi: Unable to connect to an 802.11n Wi-Fi network
- iOS: Recommended settings for Wi-Fi routers and access points
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
If still problem make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
Apple Retail Store - Genius Bar
Since both iPhone and iPod stopped connecting I suspect a problem with your network.

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Does the iOS devices connect to other networks?
Does the iOS devices see the network?
Any error messages?
Do other devices now connect?
Did the iOS device connect before?
Try the following to rule out a software problem:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Power off and then back on the router
- Reset network settings: Settings>General>Reset>Reset Network Settings
- iOS: Troubleshooting Wi-Fi networks and connections
- Wi-Fi: Unable to connect to an 802.11n Wi-Fi network
- iOS: Recommended settings for Wi-Fi routers and access points
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
If still problem make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
Apple Retail Store - Genius Bar
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Laptop not connecting to wi-fi

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