My new imac cannot connect to the Internet sometimes. What is the cause?

Sometimes after I play league of legends, the iMac could not connect to the Internet anymore. Only restarting would solve he problem. What are the possible reasons for such problem?

The warranty entitles you to complimentary phone support for the first 90 days of ownership. If you bought the product in the U.S. directly from Apple (not from a reseller), you also have 14 days from the date of delivery in which toexchange or return it for a refund.

Similar Messages

New Express cannot connect to the internet

I connected everything as descriped and ran the setup assistant, which then congratulated me with my internet acces. The point is: I'm not connected to the internet, and the Express is flashing amber. Internet works fine when connected directly to the Powerbook through ethernet cable.
When I run diagnostics I get four green lights, but "Internet" and "Server" are red.
My ISP need a static IP, but when I try to set the adress (and the subnet and DNS Server) in the Airport Admin Utility, it answers, that the IP adress is not valid, or that the combination of IP, subnet and DNS are not correct.
What are the "Domain name"? Do I need to give the ISP the Airport ID or Airport Ethernet ID? And in that case, where?
Thank you for any suggestions and MERRY CHRISTMAS

Hi,
Sounds like there are a lot of people wrestling with this.
When I ordered my airport express, I figured I could use it as a secondary base station. But that didn't quite work as you'll see from this discussion thread. I have at least got to the stage where the AE is recognised on my network, but I have yet to try setting up the printer, or streaming airtunes around the house.
I think the apple documentation for this particular product needs heavy editing.
Best
Brian
G5 Dual 2.3 Mac OS X (10.4)
G5 Dual 2.3 Mac OS X (10.4)

I can't successfully get a new iMac to connect to the school server, I can't successfully get a new iMac to connect to the school server

How can I connect my mac to the school server? It doesn't seem to "see it"

If you are using Safari, try a different browser.
Mozilla Firefox Web Browser — Free Download
or Google Chrome - The web is what you make of it

My iPad cannot connect to the app store but my iPhone can, what do I need to do?

My new iPad cannot connect to the app store and iTunes after updates from several apps but my iPhone4s can. They were both recently updated to ios6. Whats wrong with this thing?

So you are saying that after you updated several apps - now you cannot connect to the iTunes or App Stores?
"My new iPad cannot connect to the app store and iTunes after updates from several apps"
Go to Settings>General>Date and Time>Set Automatically>Off. Set the date one year ahead. Try to update the apps again. If you get an error message, go back to the settings. Correct the date and time (set automatically) then go back and try to update the apps again.
Or try this ...
Settings>Privacy>Location Services>System Services (swipe to the bottom of the page to find this)>Location Based iAds>Off.
Or this ...
Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.

I have a Power PC G4 which is running on OSX 10.5.8, it has the AirPort utility but cannot connect to the internet as my iMac can, I think I might need an AirPort Card? Is that the case or do I need something different to connect to a wireless modem?

I have a Power PC G4 which is running on OSX 10.5.8, it has the AirPort utility but cannot connect to the internet as my iMac can, I think I might need an AirPort Card? Is that the case or do I need something different to connect to a wireless modem?

Welcome!
Only one variant of the PowerMac G4 could use the faster Airport Extreme Card. The rest used the original Airport card that is pretty slow.
To get fast wireless without buying more than one thing, consider this:
http://eshop.macsales.com/item/Edimax/EW7722IN/
It goes in an available PCI slot
There are USB solutions also. However, all PowerMac G4 towers had only slower USB 1.1 ports, so any USB wireless adaptor can only run at about wireless 'B" speeds (slow) unless you also install a PCI USB 2.0 adaptor card. Doing that would allow a USB wireless adaptor to run at its maximum rated speed. These items working together would accomplish that:
USB wireless "dongle:"
Newer Technology MAXPower 802.11n/g/b USB Adapter + Plug and play direct or with extension cradle
USB PCI adaptor:
http://eshop.macsales.com/Search/Search.cfm?Ntk=Primary&Ns=P_Popularity%7c1&Ne=5 000&N=7069&Ntt=USB+PCI
Each approach has its advantages. The PCI wireless card is a one-piece solution that takes up no desk space. The USB2 card+USB2 Dongle gives you more fast ports for transferring date from other external USB devices (primarily cameras and external hard drives) at hugely faster rates than can the original ports. I have a USB 2 PCI card in my G4 tower strictly for transferring images from my digital SLR camera in a timely manner.

My PC can connect to the airport extreme but with encryption it cannot connect to the internet my iMac has no issues, any help.

My PC can connect to the new airport extreme I just purchased but with encryption it cannot connect to the internet my iMac has no issues. If I open the airport exteme up and provide no security everything is fine which leads me to believe it is something with the encryption between the two devices. Not sure what step I'm missing here this shouldn't be this difficult.

Sorry, I should have been more clear. I am asking if the DNS IP addresses, not the IP addresses assigned by the DHCP service, are the same. DNS is like the Internet's version of the Yellow Pages. Your ISP typically will provide them to you or you can elect to use those provided by another source, like OpenDNS.
DNS is the service that translates a website's URL to its actual IP address so that you can access it. I am just trying to rule out that the PC is not configured properly with the correct DNS IP information.
The other thing to check is if the PC is configured to use a Proxy service. By default, it would not be.
Finally, what is the make & model of the PC. More importantly, if the PC is using either a PCI or USB wireless adapter, what is its make & model?

I have downloaded the new update for Firefox 3.6 and now cannot connect to the internet. I've checked my firewall and have uninstalled and reinstalled firefox, but nothing works.

After installing the new update for Firefox 3.6, no matter what I do, I cannot connect to the internet using Firefox. I can get on the internet using my other browsers (Google Chrome and Internet Explorer), so Firefox is the only one that doesn't work. I have already checked my firewall and have added and removed Firefox from my firewall to no avail. I've also already uninstalled and reinstalled Firefox, but so far it hasn't helped.

I have already tried removing firefox from my firewall. Even when I do that, my firewall doesn't detect firefox and prompt me to add it. And when I manually add it, it still doesn't work anyways. I've already tried the link as well, but it has been unhelpful. :/
I'm not sure if it matters, but a few weeks before this, I did download Microsoft Security Essentials.

HT204266 I can't get any updates or download new apps because I "cannot connect to the iTunes Store" yet I am able to do other Internet related things. Please help!

I can't get any updates or download any new apps from iTunes because I "cannot connect to the iTunes Store" or sometimes it says server. I have no trouble getting my email or surfing the Internet, so it is a problem specific to accessing iTunes. Incredibly frustrated! Please help!

Saw this on another post.
Applecare Senior Advisor Txx Bxxx (I have his contact info in an email he just sent) just confirmed with me that the problem people are having with the App Store not loading is an apple issue with there servers, ITS NOT YOUR IPAD so don't go restoring it! It's not happening to everyone however but they are looking into it, its really hit or miss.
In the meantime ...........
The Complete Guide to Using the iTunes Store
http://www.ilounge.com/index.php/articles/comments/the-complete-guide-to-using-t he-itunes-store/
Can't connect to the iTunes Store
http://support.apple.com/kb/TS1368
iTunes: Advanced iTunes Store troubleshooting
http://support.apple.com/kb/TS3297
Best Fixes for ‘Cannot Connect to iTunes Store’ Errors
http://ipadinsight.com/ipad-tips-tricks/best-fixes-for-cannot-connect-to-itunes- store-errors/
Try this first - Reset the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.
This works for some users. Not sure why.
Go to Settings>General>Date and Time> Set Automatically>Off. Set the date ahead by about a year.Then see if you can connect to the store.
 Cheers, Tom

I cannot connect to the internet after switching providers. I've changed the email address associated with the new account but am sure there is something else I need to change. Can anyone help me?

I cannot connect to the internet after switching providers. I've changed the email address associated with the new account but am sure there is something else I need to change.   I have also changed the apple information as well including user name and password. Can anyone help me? (This is an ipad question).

Apple ID: Changing your Apple ID
http://support.apple.com/kb/ht5621
Using your Apple ID for Apple services
http://support.apple.com/kb/HT4895
Apple ID: What to do after you change your Apple ID
http://support.apple.com/kb/HT5796?viewlocale=en_US&locale=en_US
iTunes Store: Associating a device or computer to your Apple ID
http://support.apple.com/kb/ht4627
iOS: Changing the signed-in iTunes Store Apple ID Account
http://support.apple.com/kb/ht1311
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 drooping 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
    •    In the window that opens, tap on the Renew Lease button
6. Potential Quick Fixes When Your iPad Won’t Connect to Your Wifi Network
http://ipadinsight.com/ipad-tips-tricks/potential-quick-fixes-when-your-ipad-won t-connect-to-your-wifi-network/
~~~~~~~~~~~~~~~~~~~~~~~~~
Fix WiFi Issue for iOS 7
http://ipadnerds.com/fix-wifi-issue-ios-7/
iOS 6 Wifi Problems/Fixes
Wi-Fi Fix for iOS 6
https://discussions.apple.com/thread/4823738?tstart=240
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/
~~~~~~~~~~~~~~~~~~~~~~~
iPad: Issues connecting to Wi-Fi networks
http://support.apple.com/kb/ts3304
How to Boost Your Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Boost-Your-Wi-Fi-Signal.hmL
Troubleshooting a Weak Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/Troubleshooting-A-Weak-Wi-Fi-Signal.htm
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/
How to Fix: My iPad Won't Connect to WiFi
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
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Connect iPad to Wi-Fi (with troubleshooting info)
http://thehowto.wikidot.com/wifi-connect-ipad
10 Ways to Boost Your Wireless Signal
http://www.pcmag.com/article2/0,2817,2372811,00.asp
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
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.
Some Wi-Fi losses may stem from a problematic interaction between Wi-Fi and cellular data connections. Numerous users have found that turning off Cellular Data in Settings gets their Wi-Fi working again.
You may have many apps open which can possibly cause the slowdown and possibly the loss of wifi. In iOS 4-6 double tap your Home button & at the bottom of the screen you will see the icons of all open apps. Close those you are not using by pressing on an icon until all icons wiggle - then tap the minus sign. For iOS 7 users, there’s an easy way to see which apps are open in order to close them. By double-tapping the home button on your iPhone or iPad, the new multitasking feature in iOS 7 shows full page previews of all your open apps. Simply scroll horizontally to see all your apps, and close the apps with a simple flick towards the top of the screen.
Wi-Fi or Bluetooth settings grayed out or dim
http://support.apple.com/kb/TS1559
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

HT1695 why would my new computer with windows 8 set up fine and now all of a sudden I cannot connect to the internet on my IPaD

I have a new computer an Dell Inetel Celeron 2020 with Windows 8. I had interent connection on my old desktop and to my Iphone and Ipad, however now I cannot get my Ipad to connect to the internet whatsoever. i have messed with this since Wednesday of last week and I am exhausted from it. Please help.

So just the ipad cannot connect to the network? Does it connect to any other network?
Try this:
Reboot ipad by pressing and holding both the home and sleep/wake buttons at the same time until the apple logo appears on the screen, then let go. Then try to connect to network.
Go to settings, turn wifi off. Toggle airplane mode on/off. Make sure bluetooth is off. Turn on wif (airplane mode off). Try to connect.
Go to settings/genreral/reset/reset network settings. Then try to connect to network.
If its your home router, then reboot router by unplugging for 5-10min. (do this while you're resetting network settings).
If problem persists, then check for firmware updates on your router.(you check router manufacturer suppot website for downloads and instructions).
Wifi Settings greyed out or dim
http://support.apple.com/kb/TS1559
Recommended wifi settings
http://support.apple.com/kb/HT4199

I'm a new iPad owner. When I've rented a movie, I can't work out how to play it back without a wifi connection. I get a message which says you cannot connect to the iTunes store without an Internet connection. This happens whether I've rented or purchased

I'm a new iPad owner. When I've rented a movie, I can't work out how to play it back without a wifi connection. I get a message which says you cannot connect to the iTunes store without an Internet connection. This happens whether I've rented or purchased a film. We're going on a flight soon and would ideally like to watch one on the plane. Can someone please provide some step by step instructions. Thanks.

Rented or purchased video are watched through the videos app after you have downloaded them, iTunes on iOS devices is for buying media only.

2 of 3 computers connected to the airport cannot connect to the internet

I have an airport extreme that is connected to the cable modem, and is set to distribute IP addresses using a single 10.0.1.1 etc.
All three computers, a ppc mac mini, a 12" powerbook, and the intel iMac are connected to the base station, and that is their only connection. the pb and the mini cannot access the internet through the airport, but they are assigned IP addresses, 10.0.1.2 and 10.0.1.3.
the intel mac has more info displayed than the airport, a real IP address, 216.195.... a different subnet, and a router #.
I am afraid to change the settings that I might lose the connection to online support on the intel mac, but am totally confused as to why it would have a different IP address than it is told to have by the aebs. I need to get all these computers online today.
I am also trying to connect a new epson aculaser cx11nf printer through the ethernet port in the aebs, and it is not acknowledging anything in the port. but that's another story, and i'll likely call epson for help later, but just in case someone thinks it's related.
Thanks in advance.

Mary, Welcome to the discussion area!
From the information your provided, it is clear that your Intel Mac is not connected to your AirPort Extreme base station (AEBS). It is connected to a neighbor's wireless network.
On the Intel Mac, go to the AirPort menu and select the name of your wireless network. Hopefully you gave the network a unique name.
Ensure that you have the cable modem connected to the AEBS's WAN port.
Power off the cable modem whenever you switch the Ethernet connection. This causes the cable modem to forget the device it was talking to. When the cable modem is turned back on, it will find the new device to talk to.

I am trying to connect to my friend's wifi, i have a very strong signal indicated on my ipad, but cannot connect to the internet. Yesterday i connected without any problem, can anybody tell me why i cannot connect today?

i am trying to connect to my friend's wifi, i have a very strong signal indicated on my ipad, but cannot connect to the internet. Yesterday i connected without any problem, can anybody tell me why i cannot connect today?

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
    •    In the window that opens, tap on the Renew Lease button
6. Potential Quick Fixes When Your iPad Won’t Connect to Your Wifi Network
http://ipadinsight.com/ipad-tips-tricks/potential-quick-fixes-when-your-ipad-won t-connect-to-your-wifi-network/
~~~~~~~~~~~~~~~~~~~~~~~~~
iOS 6 Wifi Problems/Fixes
Wi-Fi Fix for iOS 6
https://discussions.apple.com/thread/4823738?tstart=240
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 Boost Your Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Boost-Your-Wi-Fi-Signal.h tm
Troubleshooting a Weak Wi-Fi Signal
http://ipad.about.com/od/iPad_Troubleshooting/a/Troubleshooting-A-Weak-Wi-Fi-Sig nal.htm
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/
How to Fix: My iPad Won't Connect to WiFi
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
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Connect iPad to Wi-Fi (with troubleshooting info)
http://thehowto.wikidot.com/wifi-connect-ipad
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
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.
Wi-Fi or Bluetooth settings grayed out or dim
http://support.apple.com/kb/TS1559
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

Cannot Connect to the Internet ?

So I am a new iPad user
very new 3 weeks
It started this morning when I downloaded updates to some of my apps - I then sync'd it with my itunes on my windows vista pc...then i noticed that the iPad screen looked really heavily pixelated in some of the apps, that weren't normally pixelly
I tried restoring my settings on the iPad only, this did not delete my apps or data
then it asked me for my wifi password again, which I put in
I then tried to access the internet on safari, and through various other apps, I get the error message, "cannot connect to the internet"
I tried syncing it again this evening, and still nothing
I am not sure what to do....

Have your:
- Reset your iPad:
Press and hold the On/Off Sleep/Wake button and the Home
button at the same time for at least ten seconds, until the Apple logo appears.
- Reset network settings:
Settings>General>Reset Network Settings
- Powering off and then back on your iPad.
- The troubleshooting here:
http://support.apple.com/kb/TS3237

New iMac will connect to Airport but not Internet

I've just bought an Intel iMac 2.94ghz, brought it home and tried to get it onto the internet.
It sees my wireless network and connects just fine, with all bars full. But if I try to view a page in Safari, I get the 'You are not connect to the Inernet' page. I've tried restarting, turning wireless on and off, restarting my router, restarting, reseting and updating the firmware on my Airport Extreme, dumping AppleAirport kexts, disabling IPv6, renewing the DHCP lease (always comes back self-assigned) etc etc but nothing helps.
Additional info:
* my iPhone, MacBookPro and girlfriend's Windows laptop all still connect to the internet fine
* my iMac can see and connect to the other computers on the network, and vice versa
* my iMac cannot connect to my router, unless I manually assign my iMac an IP address
* if I manually assign my iMac an IP address, I can see my router, but am still 'not connected to the internet'
Has anyone got any ideas what could be wrong here, or should I be taking my iMac back to the Apple store?

Bought my iMac in February and worked fine up until about a month ago. I have assigned a manual IP address outside the range of other devices in my network (e.g. 192.168.0.10) and this seems to do the trick (most of the time). The problem I had was the self assigned IP address wasn't in the usual range for my router so while I was connected to Airport and the internet I couldn't view any webpages. Had to do the same thing to my Macbook which I purchased about a month ago.
The strange and very frustrating thing is sometimes it doesn't recognise my preferred network but then when it asks me to join a network, my network appears! When I try to connect and confirm password, connection times out. Whats that all about?
The bottom line is the assigned IP solution doesn't always work but it seems a combination of issues rather than one. None of the other devices on my network (ReadyNas Duo, Xbox 360, PS3, Wii etc) have issue connecting to the router using DHCP but for some reason Airport has trouble dealing with this and assigning a correct IP or can't find the network all together.
Only thing I can think is its some Airport update that has caused these intermittent issues and realy hope they fix it soon.
So no update but just wanted to share my experiences in what seems a very wide scale issue...

My new imac cannot connect to the Internet sometimes. What is the cause?

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