My Mac Can't connect to WI-FI!! Help!??

So when I open the Internet and try to connect my Mac says the it has self-assigned ip address 169.254.107.116 and will not be able to connect to the Internet.
When I click Network Diagnostics it says :
Wi FI , on
Wi FI setting, on
Network setting, well it's yellow, not sure what I means....
ISP, on
Internet, failed
Server, failed
I use WPA2 personal, security....
Can anyone please help???
I'll been searching the wep for a week and I just can't fix it.....
It happened after a software update....

Two things that you can try.... Update the iOS if you are still running 7.0.4. Or, reboot your router. It really can help at times even if every other device in the house is connecting. Unplug it for about 30 seconds to reset it and then plug it back in again. I would also reset the iPad if you reset the router.
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 if it appears on the screen - let go of the buttons. Let the iPad start up.

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Ever since i forgot my apple id password and changed to a new one, I am continually being asked to enter my iCloud password. It then says that this mac can't connect to iCloud because of a problem with "my username". nothing I do in in preferences helps.

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You have to sign out completely in System Preference>iCloud (click 'Sign out') on a Mac, or Settings>iCloud on an iOS device (click 'Delete account' - this will not delete the account from the server). Then sign in with the new password.
Your iCloud data will disappear from your Mac or device when you sign out but will reappear when you sign back in.

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Your files are unaffected by a reset.. no reset via the reset button on the TC harms, deletes or does anything to your files.
The Factory Reset universal
Unplug your TC/AE. Hold in reset. and power the TC/AE back on.. all without releasing reset and keep holding in for about 10sec. The time is not important.. it is the front LED rapid flashing that indicates you are in factory mode.
Release reset.
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Is it Wireless you're trying to connect with?
Which Mac?
So we know more about it...
At the Apple Icon at top left>About this Mac, then click on More Info, then click on Hardware> and report this upto but not including the Serial#...
Hardware Overview:
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 6 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version (system): 1.21f4

How Does one fix this-"This Mac can't connect to iCloud because of a problem with "My Email Address"

Hello Apple Community: I receive this message multiple times a day.
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After sighing into iCloud I can not find a problem.
Is this a Yosemite issue, because thats when the issue started?
Thanks for your help..

Yes, this is a constant problem for me as well. I have 2 Macs (iMac and old MacBook Pro) running Yosemite. I seem to only get this message on the iMac. I've tried logging out of ICloud on both and logging back in; the problem re-appears randomly. I also have no issue on IOS devices.
It's mainly annoying. I open the iCloud panel in System Preferences and it tends to go away.

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I keep getting this message over and over and over.
This Mac can't connect to iCloud because of a problem with <my email address>
Open iCloud preferences to fix this problem"
I go to IC Preferences but there is nothing I can fix there that is relative.
My outbox is no longer working in MAIL so I cannot email out. I have to use my wife's MBP to send emails.
I can get emails. I didn't change anything in m,ail preferences, so what is Apple doing to me?

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I am using Yosemite on (iMac 21.5 inch mid 2011).
My question is:- Periodically when closing down Safari and only the application Safari i get the message:-
This Mac can’t connect to iCloud because of a problem with “my Apple ID”, Open iCloud preferences to fix this problem.
I don't understand this because there is no problem with "my Apple ID" and if there is what should I do when opening iCloud preferences to fix the problem.
Would appreciate some positive answer to stop this message from appearing and to resolve this problem.
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Hi, Shadiamond Murray.
Thank you for visiting Apple Support Communities.
Sometimes a simple power cycle of the router can correct the issue that you are experiencing. However, the issue could be a little more complex. Wi-Fi routers need adjustments to settings periodically for optimized performance with the constant progression of wireless device technology. Below, I have included two articles. The first article will cover basic Wi-Fi troubleshooting regarding iOS device connection. The second article cover the recommended settings for current Wi-Fi access points.
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/ts1398
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/ht4199
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http://support.apple.com/kb/TS1398
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Message Edited by seawolf688 on 06-11-2008 09:00 AM

Configuration for DSL connection:-
Before doing the following steps, you have to connect the modem to the
router's Internet Port and the computer to the Ethernet Port Number 1.
1. Press and hold the reset button for 30 seconds.
2. Then, unplug the power keep holding down the reset button for
another 30 Seconds.
3. Plug back the power back in, and keep holding down the reset button
for 30 Seconds.
4. Release the reset button.
===================================================================
Access the setup page of the router by launching an
Browser and type on the address bar, 192.168.1.1 and press enter. When
it prompts for the username and password, leave the username field
empty and provide password as "admin" (Without quotes)
click on ok.
On the main setup page the ""Internet Connection Type"" should be
on ""Obtain IP Automatically - DHCP ?. Click on the Save Settings
button.
Now click on the sub tab ""MAC address clone"".
- Click on enable
Click Clone & click save settings
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Hello
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Does the Router have a common default SSID like "linksys" or such?
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Was thje TM backup 10.6 also?
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Can't imagine something not being covered there.

My Mac Can't connect to WI-FI!! Help!??

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