MacBook Pro won't reconnect to wifi after being closed or put on sleep

I have a 2011 13.5 inch MacBook Pro, since updating to 10.7.5, it will allow me to connect to my wifi manually, but after I close the lid/screen or put it into sleep mode, when it loads back up it will not automatically connect to my wifi again. but when I put the password back in it will connect, how can i change it so it doesn't need the password each time? my iphone and Ipad had a similar problem but they eventually stopped asking.
Thanks.

Finally this is solved for me. I have a Macbook Pro w/Retnia 2013 model. I tried everything I could think of and read in the forums:
deleting all the plist files in SystemConfiguration (some never returned - don't know why, but hasn't caused an issue)
Reset the SMC
Reset the PRAM
Changed the Network Location
Disabled Wake for WiFi in Energy Saver
Removed all WiFi settings and reset them up
changed the order of when bluetooth is enabled vs. connecting to WiFi (I don't remember the specifics on this one)
and some more things I don't even remember
Nothing worked. I had called support a few times and they were not able to help until another try on 4/14/14.
The fix that worked for me was to stop using a 2.4GHz router and use a 5GHz instead. For me this was easy because I have a dual band wireless router. I was connecting to the 2.4GHz transmission and was easily able to switch to 5GHz. (for the differences: http://kb.netgear.com/app/answers/detail/a_id/24246/~/what-is-the-difference-bet ween-2.4-ghz-%26-5ghz%3F).
The last person at Apple told me it was documented in his knowledge base that 5GHz is the preferred wireless band and the 2.4GHz will cause issues with bluetooth.
If you are in the same boat as me, feel like you have tried everything, maybe this will work for you too.

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MacBook Pro won't connect to WiFi after installing a new modem...

WiFi set up fine on the other Mac in the house (MacBook Air) and on my Android phone (using WPS button on modem). I can find the network in the dropdown, but when I enter the password, it says "invalid"—even though it's correct. In the Network portal, I also get an error message saying that there is "no IP address"? Can't set up on iPad either. All used to connect just fine to the old network, just by entering a password. Any thoughts?

Hmmm...yes, there should be, although resetting the modem isn't hard (unless they mean something along the lines of resetting to factory settings). I wonder, tho, if the modem is old enough that something in your new computer is not communicating with it.
Can you connect with an ethernet cable? That might help you figure out if it really is a problem with your modem. You might also check with your internet service provider. I realize not all of them can deal with Macs, but if you rent the modem, they might be able to get you a newer model and if not, they may be able to make a suggestion.

Brand new MacBook Pro won't connect to WiFi after one day.

I got my MBP replaced by Apple on Sunday. I used it a bit that night, and let migration assistant transfer everything over from by backup drive overnight. I used it for a few more hours the next day, no problems. I brought my computer over to my friend's room (we're in a dorm building) and tried to connect to her WiFi. Whenever I try to connect to a network, there's an "!" over the WiFi bars in the status bar, and in Network Preferences, under WiFi, it say "No IP Address."
I am having the same issue in my Windows partition as well, which leads me to suspect this is a hardware issue. I am still able to view WiFi networks. I just cannot connect. Any suggestions? Thanks.

Hmmm...yes, there should be, although resetting the modem isn't hard (unless they mean something along the lines of resetting to factory settings). I wonder, tho, if the modem is old enough that something in your new computer is not communicating with it.
Can you connect with an ethernet cable? That might help you figure out if it really is a problem with your modem. You might also check with your internet service provider. I realize not all of them can deal with Macs, but if you rent the modem, they might be able to get you a newer model and if not, they may be able to make a suggestion.

My MacBook Pro won't reconnect to my Wi-FI automatically after waking from sleep mode

Hello, everyone. Since I updated to Yosemite, my MacBook Pro won't reconnect to my Wi-FI automatically after waking from sleep mode.
Does anyone know how to fix that?
Thanks in advance,
Arthur.

Hi, arthurpacifico.
Thank you for visiting Apple Support Communities.
Here are a couple troubleshooting steps that I would recommend trying to see if it corrects this issue.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Reset your computer’s PRAM
http://support.apple.com/kb/HT1379
If the issue persists, try the troubleshooting steps I have attached below.
Symptom: After restarting or waking from sleep, my computer might not connect to the Internet
After waking from sleep or starting up, your computer may not show that it is connected to a Wi-Fi network.
After start or wake, your computer may indicate that it is connected to a network, but does not connect to the Internet.
Solution
Use these steps if your computer does not automatically connect to your desired Wi-Fi network.
Check your TCP/IP settings in the Network pane of the System Preferences. Click the "Renew DHCP lease" button
Choose System Preferences from the Apple menu.
Choose Network from the View menu.
Select Wi-Fi, then click the Advanced button in the lower-left hand corner of the screen.
Click the TCP/IP tab from the top of the screen.
Click the "Renew DHCP lease" button.
Select the Wi-Fi tab and view your Preferred Networks list.
Select each network and click the minus sign to remove those networks from your Preferred Networks list.
Click OK and close the Network preferences.
Remove your stored network passwords using the Keychain Access Utility.Restart your computer.
Open Keychain Access from /Applications/Utilities. Your window will look like this:
Remove your AirPort network passwords from the login keychain: Select the "login" keychain from the Keychain sidebar. Click the "Kind" column to order the list of keychain items by their type. Remove all entries of the kind: "AirPort network password".
Remove your AirPort network passwords from the System keychain: Select the "System" keychain from the Keychain sidebar. Click the "Kind" column to order the list of keychain items by their type. Remove all entries of the kind: "AirPort network password".
Note: The above steps will remove your Wi-Fi network passwords. If you do not know them, or if your network does not use passwords to restrict access, you should contact your network administrator.
Join your Wi-Fi network. You will need to enter your password for your network again if it requires one.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/ht4628
Cheers,
Jason H.

Macbook Pro won't connect to WIFI

Help! My new Macbook Pro won't connect to my home's existing WIFI network. The other computers (PCs) are running on it without a problem but when I try to join the network it rejects my password as being incorrect, though it definitely is the right one!

Check to make sure the Caps Lock is off.
What type of wireless security are you using? If it's WEP Mac's don't do WEP anymore and you will need to change it to WPA or WPA2.

Macbook pro won't boot, or crashes after boot

My 2009 Macbook Pro running OS X 10.5 either has difficulty starting up, or after start up, it crashes. However, it seems to only crash when attempting to stream video from any web browser I've tried using (Firefox & Safari, (Chrome not supported by 10.5)).
When the computer starts up successfully, all seems ok until I try streaming video, usually from YouTube or similar. Then after about 2 minutes of it playing the video, the screen will freeze, audio will continue, and then the screen flashes wildly like a strobe light, or sometimes a checkered/plaid-like pattern appears on the screen in weird reds and blues.
When the computer does not boot at all, it will either appear to be booting, then freeze on the blue screen. Or as soon as I power up, I'll get the grey screen but it will have the checkered/plaid-like pattern on it, and it will stay there forever until I hold the power to turn it off.
Most of the time booting in safe mode will be successful, and from there I will run Disk Utility, my hard drive appears OK, but I have to repair disk permissions a few times before it says everything is OK. Sometimes attempting to boot in safe mode is not successful, so I will boot in Single User mode and run fsck -fy code until I get the "OK" message.
I'm out of ideas, and the problem doesn't seem to be going away. Do I need to erase the disk and reinstall OS X or update to a newer version of OS X?
Thanks in advance for any help.

Sounds a bit like a heat issue.
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.bresink.com/osx/TemperatureMonitor.html
Sadly, it also sounds like this, which doesn't cover the 2009 MBP...
http://xlr8yourmac.com/archives/feb15/021915.html#MBPvideoRepairProgram
Open console in Applications>Utilities, check the system log for the date/time of the last crash & the Startup right after that for clues.
Click on the top line we want, Shift plus click on the bottom line we want, CMD+c to copy, then paste the text in a reply with CMD+v
A few dozen lines should be about right, hundreds or thousands won't likely be readable.

MacBook pro won't shut down only after sync with iTunes?

MacBook pro stays on blue screen with spinning gear when I try to shut down only if I have synced either an iPhone or iPad with iTunes. If i have not synced with iTunes the shut is ok.
Any suggestions would be great :)

I had the same problem and just fixed it.
What I did:
- Launch Disk Utility > Select Macintosh HD > Verify Disk
Let the Verify run until it's done
- If you are seeing any error try the Repair disk
It's possible you need to restart (holding cmd+r while restarting)
- Next I did a verify disk permissions and a repair disk permissions
- reboot
After this the shutdown issue was gone!
Hope this solves your problem as well.

Macbook Pro won't connect to wifi but other computers are working perfectly

Hi,
I have a 2012 MacBook Pro that connects to WiFi no problem anywhere else - except for my parent's house (who I am currently visiting). There are 2 other PCs in the house that connect to the WiFi without a problem, as does my iPhone. When I try to connect, the Network Setup Assistant keeps saying "Connection Timeout" and then when I go into "Assist Me" the error comes up as "The password you entered is invalid." I know that the password is correct, but I can't get passed this step...tried restarting computer and router but no luck.
Help!!

Click the Advanced button in the Network preference pane, then the TCP/IP tab. Type something (anything, as long as it's unique) in the DHCP Client ID text box. Click OK, then Apply. Reopen the TCP/IP tab and click Renew DHCP lease.

Macbook Pro won't connect to wifi while all other macbooks in house will.

I have a MacBook Pro running 10.6.8 and we got wifi at the house this afternoon. It will not connect, if I open network diagnostics the top four lights are green, internet and server are red. There are two other macbooks in the house(at least one also running 10.6.8) and two ipads, all of which connect with no problem. The macbbok in question connects fine at coffee shops and, up until a week ago, fine with the wifi at my last apartment.
We are using Charter and the router is a Motorola SBG941.
Thanks for any advice you can give!

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:
Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
Netspot
How to diagnose and resolve Wi-Fi slow-downs
Pv6 troubleshooting
Mac OS X 10.6 Help: Solving problems with connecting to the Internet
What Affects Wireless Internet?
Solutions for connecting to the Internet, setting up a small network, and troubleshooting

Help!!macbook pro won't start up OSX after bootcamp remove vista drive

My Macbook pro (10.5.6) fail to boot into Osx after i used bootcamp to remove the vista drive.
as i start the mac it stop at the apple backgroup with the "wheel" forever.
i tried the Command + s (Single user mode) use fsck -f command, it end up with fail to fix after 3 attempts. I also tried to boot with install Disc , and try utility , the verify and repair option is Grey out.
Anyone know how to fix it ? i dont want to reinstall my os, but if i have to do so how can i recover some of my files from it ? Thanks~~~~~~~

You might try a PRAM reset followed by a Safe Boot:
http://support.apple.com/kb/HT1379?viewlocale=en_US
http://support.apple.com/kb/HT1455?viewlocale=en_US
With the PRAM reset, some people have recommended holding the keys down until the third chime.
Good luck!

MacBook Pro won't detect Thunderbolt display after sleep

I've noticed a rather anoying bug with Mavericks (or at least this issue only started after upgrading to the latest Mavericks) When the MacBook goes to sleep and I wake it up again, it no longer recognises the Thunderbolt display and USB devices attached to it. The only way yo resolve the problem simply is to remove the thunderbolt cable and re-insert it.
Has anyone else come across this or have any views on how to resolve more permanetly.
Many thanks
Stuart.

I have the same problem and I find it very annoying. There are many threads on the Internet (such as https://discussions.apple.com/thread/5602696) but so far no solution. :-(

Macbook Pro won't connect to wifi router

My laptop won't connect to my wifi at home when I go into my room. The wireless router is on the other end of the house and I know you'll probably say it's out of range, but i've been in the same room for 2 years and i've never had problem connecting it until up to a couple of weeks ago. Nothing has changed in the set up of the house, it just randomly stopped connecting. Can anyone suggest what may be wrong??
Thanks.

It could be that one of your neighbors has added a router that's basically overpowering yours. Try logging into the router and changing the wireless channel.

Macbook Pro won't boot up immediately after today's update

I installed the update that auto updater was letting me know needed to be installed today.
It was a Safari update and a security update. (I didn't catch the number but it just became available today)
Now after my Mac rebooted itself it goes no further than the grey screen and the spinning grey wheel. I'm pretty good about keeping my Mac updated regularly.
Anyone have any clues as to what's going on here?
Tried restarting a few times, reset the battery and zapped the PRAM, all to no avail. Also ran Techtool on it and it didn't help either...
Of course Applecare is closed...Has anyone else experienced this?
Something very similiar happened (immediately after an update) back in June but that time I was getting the international prohibitory symbol...that time I had to do an archive and install of the system software. I'm thinking I'm heading in the same direction with this one.
From what I've been reading on these message boards it seems like this happens occasionally and I too was experiencing terrible slowdowns a couple of months ago that were fixed by either a software update or the resetting of the computer battery / PRAM etc.
Isn't it a strange coincidence that this is happening again? Could this be indicative of some worse problems with my Mac? Or is it just a faulty install of the update?
Any ideas would be appreciated,Thanks
-schin

Thanks for the info.
Actually, I fixed it by simply restarting in Safe Mode (Holding the Shift key down upon restart)
It actually took about 10 minutes of holding the key down but eventually it did indeed start in safe mode and I logged in. After doing this, I did a shut down and restarted it repaired what ever directory errors it had. It gave a prompt about repairing something (I didn't catch what it said)
and then it's been fine since then.
AppleCare says with every update there is a small percentage of Macs that don't play nice...
so this time I was the unlucky one, but luckily it was a simple fix.
Thanks again for the reply!

My macbook pro won't connect to wifi

Every other computer in the house connects just fine, but mine won't connect. Airport says I'm connected, I've picked the correct network, can't figure out what is wrong. This has been happening periodically since I started using this network 6 months ago. I never had any problems before that. I can usually connect just fine, but every couple of week it is down for 2-3 days, then it just mysteriously starts working again. I've tried deleting and recreating airport as I've sen suggested elsewhere, but that did nothing. Not sure what to try now.
Thanks for the help.

Restart the router. Wait until all the lights are lit up.
Restart the computer.

My MacBook Pro won't connect to the Internet via wifi but it worked fine on ethernet cord...I tried running diagnostic but it didn't work:(((( it happen every time if I restart the modem and/or router

My MacBook Pro won't connect to the Internet via wifi but it worked fine on ethernet cord...I tried running diagnostic but it didn't work:(((( it happen every time if I restart the modem and/or router.. Any idea how to fix this?

Hello Rattisate,
Sorry to hear you are not able to connect to Wi-Fi on your MacBook Pro. I would be concerned about this too. You can find information on how to troubleshoot this in the following article:
Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
http://support.apple.com/kb/HT4628
Follow the steps in the section labeled, "Symptom: My Mac does not connect to the Internet."
Thank you for posting in the Apple Support Communities.
Best,
Sheila M.

MacBook Pro won't reconnect to wifi after being closed or put on sleep

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