Why doesn't my macbook pro connect to wifi?, why doesn't my macbook pro connect to wifi?

I have to different routers in my house, and one of them i recently changed the carrier and the passcode and ever since i cannot connect to it, while the other works fine.

i recently changed the carrier
Contact the carrier to make sure you imputed all their information correctly.
Read your routers user manual, call their customer support department or visit their website for further support.
Other things to try - Change your router channel. Sometimes this is all you will have to do.
Power cycling the router. Read the router's user manual or contact their tech support for instructions.
System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
Highlight Airport
Click the Assist Me button
In the popup window click the Diagnostic button.
System Preferences/Network- Unlock padlock. Highlight Airport. Network Name-select your name. Click on the Advanced button. Airport/Preferred Networks-delete all that is not your network.
Place a check mark next to "Remember networks this computer has joined." Click the OK button and lock the padlock. Restart your computer.
http://support.apple.com/kb/TS1920 Mac OS: How to release and renew a DHCP lease
No internet connection (wireless)
Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).
Delete all extra entries that you find.
Place a check mark next to "Remember networks this computer has joined."
Other resources to check into:
Mac OS X 10.7 Help: Investigate your network connections
Mac OS X 10.7 Help: Check the status of your network connections
How to diagnose and resolve Wi-Fi slow-downs
Pv6 troubleshooting
What Affects Wireless Internet?
Solutions for connecting to the Internet, setting up a small network, and troubleshooting

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I can't connect to my iTunes library on my Macbook Pro using the Apple Remote app on my iPhone 4S. Why?

Hi all,
I've been looking through the forums for help with this problem. There are a couple of threads with similar problems, but no solved threads and the discussion doesn't seem to go anywhere... As far as I can tell, it's been causing a lot of annoyance for many users, including myself, but it looks like the community's in the dark about why it's happening!
I'm trying to connect to my iTunes library using the Apple Remote app on my new iPhone 4S. As you may know, there are two ways to do this:
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From the Remote app start screen, I tap the "Turn on Home Sharing" button. I enter my Apple ID details (which are definitely correct), and get a confirmation message on my phone saying "Home Sharing is on using [my email address]. To control iTunes: Choose Turn On Home Sharing from the Advanced menu in iTunes on your computer." I then go to iTunes, turn on Home Sharing, enter my Apple ID again and get a confirmation message saying "Home Sharing is now on", etc. However, there's no connection formed between my iPhone and my Macbook Pro - the Remote app just shows a message saying "Turn on Home Sharing in iTunes on your computer or on Apple TV using the account [my email address].
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After trying both methods, I went through all of the troubleshooting steps here: http://support.apple.com/kb/ts1741 . Absolutely no effect.
I should mention that I was experiencing similar problems on my old iPhone 3Gs with an older version of iTunes. I thought it might have been some kind of hardware fault and expected it to clear up once I got the new phone, but the problem is still there. It's a new phone, a new computer, a newer version an iTunes... even a different network I'm trying to connect to it on. Bizarre!
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I have the exact same problem trying to use the Remote app on both my iPhone 3gs and iPad 2 with either my Mac or ATV2. My Remote app used to work on my phone - I can't recall if I ever actually used it with my iPad, but when I tried today, I got all the same results as you did (on both iPad, and then iPhone). I was using my ATV2 to play music from iTunes on my Mac and wanted to use the Remote app, but it would not connect to either device no matter what I did.

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HT4628 My macbook pro doesn't connect to the Wi-Fi at home while my iPad connects to the same Wi-Fi. When I try connecting my macbook to my iPhone's personal hotspot, the internet works but the issue is connecting my macbook to the Wi-Fi. Please help!!

My macbook doesn't connect to the Wi-Fi at home while my iPad connects to the same Wi-Fi. When I try connecting my macbook to my iPhone's personal hotspot, the internet works but the issue is connecting my macbook to the Wi-Fi. Please help!!
I don't understand how to fix this and I don't seem to understand where the problem is coming from.

Let's try the simple approach first. Restart your router. Any change?

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So I've got a curious situation here. We ordered 3 new 13" MacBook Pros Retina (2013 model) and we were testing a cable hookup with a co-workers 13" MacBook Pro Retina (2012) but it doesn't seem to recognize the Monitor as being connected.
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I would check that both devices are connected to the same network and maybe even power cycle the network devices - eg router etc
Maybe even try to connect both devices to another network like an iPhone personal Hotspot and see if that helps to isolate the problem

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I was using my macbook as a wireless router [it is connected to an ethernet cable]
for my ipad.
.....by turning "internet sharing" on in system prefs, and setting up a network.
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I've probably changed some settings now after mucking about with it in frustration....
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Some things to try first:
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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/
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https://discussions.apple.com/thread/4823738?tstart=240
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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
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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
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Apple's iOS 6 Wi-Fi problems
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~~~~~~~~~~~~~~~~~~~~~~~
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http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
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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
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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

What is the exact name of the cable I need to connect my old hard drive from my macbook pro (it has been taken out of the computer) to my new macbook pro? I need to transfer files from the old hard drive to the new computer.

What is the exact name of the cable I need to connect my old hard drive from my macbook pro, which has been removed from the computer, to my new macbook pro? I need to transfere files from the old hard drive to the new computer.

No eSATA to USB. Just a SATA/IDE to USB adapter. Google SATA/IDE to USB adapter and you will get tons of links to buy them. Most likely your local computer electronics store has them, although they might be more expensive buying locally than online.
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You can tell Apple directly at the link below.
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Why doesn't my macbook pro connect to wifi?, why doesn't my macbook pro connect to wifi?

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