Brand new MBP rarely detects Wifi network- 4 other devices have no problem

I am using a 4-week old MBP with Lion that was installed via the App Store immediately after purchase.
I read up on the Wifi issues with the MacBook Pro / Lion but mine seems a bit different.
Once I get connected to Wifi, the connection doesn't drop and is not weak, however, getting the connection is the problem. Airport detects my network off the bat only about 50 percent of the time. I live in a city with about 20 networks available at any given time. When I click on the airport icon, the same 4 networks (not mine) appear immediately every time. After waiting or re-clicking, if I'm lucky mine will show up in the list after about 20 to 30 seconds, but sometimes it doesn't show up at all. Restarting the router doesn't seem to help. Sometimes rebooting the computer does, and once in a while after a reboot my MBP will find the network immediately and auto-connect... when it does that the pages load at lightning speed and it works great until the next disconnect (when it sleeps).
Could this be my router just being too old for my MacBook Pro? My iPhone, iBook, PowerBook G4 and Asus laptop have no problems.
I've tried changing the broadcast channel on the router, deleting the plists frequently mentioned in these forums, deleting and re-adding the wireless connection (many many times), moving WLAN up to the top of the list in Network Prefs, updating router firmware, routing through my iPhone (no problem)...
Please help! Should I take it back to the store for an exchange? I bought it in the US and live in Germany... not sure I can even do that.

System Preferences > Network > Airport/WiFi
Even if WiFI is at the top, use the gear below the list of Interfaces to choose "Set Service Order" and put Airport/WiFi at the TOP. This will make a big difference.
Click ( Advanced )
In the WiFi/Airport pane, be sure the Networks you most want to join are listed at the top of the list, and feel free to delete any you don't care to join automatically. Once you have a good list, check [√] Ask to join networks (rather than just joining them).
In the TCP/IP pane, set IPv4 to DHCP and set IPv6 to OFF or Manually OFF.

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Brand new MacBook cant fing Wifi network

I've unpacked my new MacBook last night and plugged it in to fire up. The screen came on and the set up wizard found my wifi network which I tried to join by entering wifi password...but it just thinking about it (little times circle) and wifi networks no longer listed.

What is the wireless router?? Actual make and model.
If it is non-apple sometimes you can run into troubles.
I recommend you log back into the wireless router and set a new name.. SSID for the wireless.
Please use a name that is short, no spaces and pure alphanumeric.
Use no wireless security. See if the computer can connect.
Once you complete that exercise.. now add security.. WPA2 AES (personal on apple routers).
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If it fails then the wireless is not compatible.

I have an Ipad 4 and its been working fine up until the last week, and now it is very unreliable connecting to the internet and loading pages. It connects to the Wifi network without any problems, all my other devices have no problems at all. Any help?

I have reset netwrok settings, ip addresses are all fine, restarted my router, but I may be missing something. Anyone else having similar problems?

Some things to try first:
1. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
2. Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
3. Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
4. Go into your router security settings and change from WEP to WPA with AES.
5. Renew IP Address: (especially if you are droping internet connection)
    •    Launch Settings app
    •    Tap on Wi-Fi
    •    Tap on the blue arrow of the Wi-Fi network that you connect to from the list
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~~~~~~~~~~~~~~~~~~~~~~~~~
iOS 6 Wifi Problems/Fixes
How To: Workaround iPad Wi-Fi Issues
http://www.theipadfan.com/workaround-ipad-wifi-issues/
Another Fix For iOS 6 WiFi Problems
http://tabletcrunch.com/2012/10/27/fix-ios-6-wifi-problems-ssid/
Wifi Doesn't Connect After Waking From Sleep - Sometimes increasing screen brightness prevents the failure to reconnect after waking from sleep. According to Apple, “If brightness is at lowest level, increase it by moving the slider to the right and set auto brightness to off.”
Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
iOS 6 iPad 3 wi-fi "connection fix" for netgear router
http://www.youtube.com/watch?v=XsWS4ha-dn0
Apple's iOS 6 Wi-Fi problems
http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
~~~~~~~~~~~~~~~~~~~~~~~
How to Fix a Poor Wi-Fi Signal on Your iPad
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Fix-A-Poor-Wi-Fi-Signal-O n-Your-iPad.htm
iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
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http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
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http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
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http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
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http://thehowto.wikidot.com/wifi-connect-ipad
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How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

E540 Can't detect wifi visible by other devices

Hello community,
I would like to ask for help. I am facing a very strange problem. I have windows 7 Professional 64bit (SP1) installed Lenovo Edge e540 notebook with Intel(R) Wireless-N 7260 wiffi adapter. I am not able to even detect my home wifi network, that is detected with my other devices (another laptop, smartphone) without problems.
I have to mention, that at work, I can detect all surrounding networks (b, g and n).
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Moderator Note; subject edited.

Hi Jiri,
which channel is your home router transmitting on and have you tried changing this? Is the router set to broadcast the SSID?
You might also like to post which router you have and the type & model number of your E540, please do not post your serial number.
Andy ______________________________________
Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points
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Error joining network - but other computers have no problem

I've been frustrated by one of three computers in my house having an issue joining my wireless access by Airport (via Westell VersaLink issued by dsl provider) .
My MacBook Pro won't connect to the network, telling me, after I enter the WEP password: << There was an error joining the network "X". >>
The other two computers I use at home, my wife's PC laptop and an old iMac, connect flawlessly with same password. The MacBook had connected fine previously. One day (6 months ago?) it just started with the issue and hasn't connected since.
The MacBook travels with me a lot and has no similar connectivity issues in other locations.
After I enter the correct password, it takes about ten seconds to report the error. If I enter the incorrect password, it tells me virtually instantly the same message as above.
Message was edited by: winfieldscott

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I had the same problem with my new Retina Macbook Pro and my Magic Mouse that worked fine on my previous 2010 Macbook Pro. At work I don't have a wifi network so I share my ethernet connection via wifi so I can get internet on my iPhone and iPad during the day. After reading this thread I tried turning off the internet sharing and it has cleared up all lag issues with the mouse.
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Help!!! Brand new MBP with Santa Rosa Kernel Panics when started with external HD firewire 800 after 20 sec...
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Do you???
Thanx
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