Solution to 'my macbook won't detect my wifi anymore'

So my macbook connected to my wifi fine, then suddenly it stopped detecting it even though every other device I had detected it fine. After hours of searching the web I finally found a solution that worked for me. I saw that this problem is fairly common so I thought I'd share it on here aswell.
All you need to do is go to network preferences, select airport, then advanced, then under preferred networks delete the network you're trying to detect (you may want to write down its name at this point), then click apply. Turn off airport then turn it on again. Then click 'join other network' and manually type in your networks name and password in and it should connect.
This method worked for me and hopefully it'll work for anyone else having this problem.

You should mark this post with the "This solved my question" check mark so that others no there is a solution here rather than a post with only views and no replys. Good find by the way!

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Macbook won't detect external display anymore - Random shutdown injury??

Hi,
my Macbook has the dreaded random shutdown thing happening, often it can't even get through the startup sequence. If I reset the PMU and PRAM and check the disk every week I can keep it running. Applecare are making not particularly helpful suggestions like "run it in safe mode" - hello people, random means it can take days to happen again... I use this computer for work so I need it at full capacity every day!!!
Anyway, enough angry ranting. The casualty of today's RS and subsequent PRAM PMU resetting is my external display (Viewsonic LCD). The macbook is no longer sending signals to it (display says "no signal"). When I ask the macbook to "detect displays" nothing happens. I have restarted the macbook several times and unplugged and replugged the display connection it doesn't help. Yes, I have the AC power cable plugged in on the Macbook (I know it doesn't like talking to the screen if I don't).
The display and macbook have always worked fine together in the past...
Does anyone have any suggestions on how to test for causes or fix this display related problem?
MacBook Mac OS X (10.4.8)
Powerbook G4 Mac OS X (10.4.2)

You don't mention ever having brought the problem to Apple's attention, or what resulted from your request for Apple's help with it. This isn't a universal or widespread problem. It may be a hardware fault in your own equipment that needs to be resolved with a repair, or it may be a software problem (corrupt file, incompatible software conflict, update needed, etc., etc.). You seem to think Apple should have fixed it for you without your lifting a finger, and you're eager to complain about Apple's lack of support. But you've offered nothing to indicate that Apple even knows you need support. You do have to ask for it. Have you done so?
We have no idea what steps you've taken to try to narrow down the possibilities, e.g., making sure the monitor is turned on; trying a different video cable as iVmichael has suggested; testing the monitor with the same cable on a different computer; testing a different monitor with the same cable and then with a diferent cable on your computer; substituting a different cable adapter, if you are using one; applying all applicable system software updates and then Repairing Permissions and Repairing Disk; starting in Safe Mode and seeing whether the monitor is recognized and activated then; seeing whether the monitor is detected in System Profiler; and so on. You may have done some of these things, but you haven't told us about them or about the results.

MacBook won't detect Toshiba 1T external hard drive

I just upgraded my operating system on my MacBook Pro and now my laptop won't detect my Toshiba 1T external hard drive, even though I've been using it before. Any ideas?

Adam513, turned out the latest operating system doesn't read Microsoft formatted external hard drives the way it used to. I had to purchase a new external hard drive, them find an apple computer with an older version operating system so I could transfer my files to the new external which is formatted for Mac. The new external works fine and once I have all the files transferred, I'll reformat my old external hard drive. Took me and the guy at the Genius Bar a while, but we finally figured this out. Hope this helps!

MacBook suddenly won't detect my TV anymore - already tried anything

Hello everyone,
I hope I can find help here... I couldn't find any in Apple Stores...
_+*If you don't want to read the long text, there are some cliff notes below*+_
I have a problem with my 42" Toshiba LCD TV.
Here's my setup:
MacBook 13" Unibody with 4GB RAM, Snow Leopard 10.6.4 and all the latest updates.
I used to use it as my movie display, only plugging it in when watching a movie etc... For work I am using a Dell 2209WA, which is still working perfectly with exactly the same cable configuration.
My connection should be standard and looks like this:
1. Mini-Display Port to DVI
2. DVI-to-HDMI-cable
3. Plugged in into my TV
Some day, I decided to watch a movie, plugged of the Dell and plugged in the Toshiba TV. No signal, my MacBook didn't even detect any external display.
I searched up the internet, and found that there were problems with the update 10.6.2, and after 10.6.3 seemed to work for most of the persons concerned, 10.6.4 seemed to mess it up once more.
Fortunately I am running time machine, so I started to restore older OS X versions, starting with 10.5.8 and going the way all up to 10.6.4 again. It just wouldn't work. So I formatted my MacBook and made a fresh install of Mac OS Snow Leopard, again starting with every single update step. But nothing worked, so I restored my latest 10.6.4 backup.
I went to a friend's house and connected my MacBook with the same cables to his TV, and it worked perfectly. I then visited an Apple Store, describing my problem and connecting it to their TV - it worked. I was like... come on!!!
Nevertheless I bought a new MiniDisplay-Port-to-DVI-Adapter I could bring back any time, just to test it. I even bought new cables. Nothing helped.
I then started to reset PRAM, and CMS. I moved stored display profiles to trash, restarting and hoping it would work, but nothing...
Any time I connect the DisplayPort, my MacBook screen blinks, as it should, but does not recognize any display. I tried SwitchResX, nothing as well.
_+*Here are the Cliffnotes of what I've done and what's going on:*+_
MacBook won't recognize/detect Toshiba TV
MacBook recognizes/detects Dell TFT with same cable configuration
MacBook works fine with other TVs
I changed cables
I changed HDMI ports
I tried another adapter (DisplayPort)
PRAM and SCM reset without success
Deleting display profiles without success
I tried every Snow Leopard Release from 10.5.8 to 10.6.4
SwitchResX did not work
I restored my TV's standard configuration, and turned any auto image adjustion off
checked whether MacBook is concerned by nvidia callback - negative
It seems that there is either a problem with my television or with my driver's/software's configuration on the MacBook. Maybe it is sending a signal/resolution that cannot be displayed, but why should it?
If it does, it would have to detect the TV first I guess... A fact that brings me to the point that it might be the TV and not the MacBook is that it didn't even work with a fresh installed SL, so there were definately no wrong display profiles saved and applied.
I don't know what to do, is there anyone who can help me? Any advice is greatly appreciated!
Regards from Germany
dohdoh

dohdoh1985, I have the exact same problem also! I recently bought a 42" RCA LCD TV. I connected my MacBook Pro to my TV using a Dynex Mini DisplayPort to HDMI adapter that I got from BestBuy. It worked great until I upgraded to Mac OS 10.6.4 and then it suddenly stopped working. Same TV, same settings, same cables, same adapter. Nothing changed since the last time it worked except that my OS was upgraded to 10.6.4, so i am assuming that is the culprit. The symptoms are EXACTLY the same as what dohdoh1985 described; when I plug in the TV, the laptop display flashes (3 times) as though it is detecting an external display and the picture on the TV briefly goes from blue to black for about 1 second then back to blue. The TV does not appear in the display menu / control panel and there is no sign that the MacBook detected it. I went through the usual troubleshooting steps (reset PRAM, checked connections, tv settings, etc) but nothing worked. Other HDMI sources (i.e. Blu-ray player) work fine on the TV using the same HDMI cable on the same port so there is nothing wrong with the cable, the TV or the TV's input settings.
Meanwhile, I can still connect my MacBook to my external ViewSonic monitor at work without any problems. It's just the TV that's not working.
I cancelled my cable subscription a while ago since I only watch shows online nowadays and this was my only way of watching TV shows, so I'm quite upset.
Apple, please help!

My iphone 4s won't detect any wifi networks.

Hi
My iPhone 4s won't detect any wireless networks. It was working fine until last night when the connection dropped int he middle of me watching a programme. At first I thought it was our router, but I reset that about 5 times, and all other devices are working fine on it. The phone won't detect any other networks either - if I ask to join a network it comes up with the message "could not scan for wireless networks". I have tried resetting the network settings as suggested on the support page, but it hasn't worked. Can anybody help? Thank you.

If no change after resetting network settings on the iPhone, try restoring the iPhone with iTunes as a new iPhone or not from the backup.
If no change after that, the iPhone has a hardware problem.

MacBook won't connect to wifi but iPhones will?

Help! My MacBook will not connect to wifi at home. All other devices do, but none of the MacBooks. Weird, right? I've tried every fix I could find in these forums and nothing works. Diagnostic test says network is working fine...

i sometimes run to these issues when i have my nieces and nephews visiting me and a lot of devices trying to connect to the same router - some will connect and others won't.
I solved my issue by getting into my router's settings and changing the channel - under the wireless section.
I also changed all my macbooks dns settings to the image below.
give that one a go and see if that helps you out.

Macbook won't detect an external display

Recently I decided to attempt to connect my Macbook to my new Sharp LCD TV. I have a mini DVI to DVI cable and then a DVI to VGA. When I hook up my Mac, nothing comes up. The television similarly displays 'No Signal'. The screen on the macbook goes blue briefly and then back to normal, but nothing has been detected. I've tried to use Detect Display but nothing happens. Do I need better cables? There's an HDMI port as well as the VGA port on Sharp TV do you think that would work better?
Any help would be much appreciated!

The Apple Mini DVI to DVI Adapter can only pass digital signals, not analog ones. So trying to use another cable or adapter to go to VGA won't work. Since you already have the DVI adapter, you could get a DVI to HDMI cable and try that.

HT4628 Macbook won't connect to wifi, but will connect to mobile iphone, any solutions?

Long story short, I downladed an illegal file on my computer, and my internet provider cut me off. They made me connect an ethernet cable to the modem to go online and sign a I will not ever do again ordeal. Ever since then though, my computer will not connect with its wifi. My mobile iphone would connect easily and internet is fine. Just with my Macbook it won't connect. I brought the laptop to work and it would connect with other wifi networks easily, just not the one at home. any solutions?

Ever since then though, my computer will not connect with its wifi.
Is its your ISP wifi? If so, have you tried others (hot spots)?
Find Free Hotspots

My MacBook won't detect my monitor

Help! I have an I-INC monitor (iH252) and a mini-USB to HDMI adapter cord to connect it to my 2010 MacBook Pro. However, Detect Displays does nothing, and the monitor tells me "No Signal Input, Check Video Cable" when I turn it on. Is there some way to force my MacBook to recognize that it is connected to an external display?

My 2010 13" MacBook Pro isn't detecting my external monitor either, even after resetting PRAM, SMC. I'm using a mini DVI to DVI adapter. But my brother's new 2011 17" MacBook Pro works just fine with the exact same setup. We both have the latest version of OS X Lion.

Macbook won't detect ethernet cord...

Hey guys-
I'm staying in my girlfriends dorm and last night and earlier this morning the internet was working fine on my Macbook and then all the sudden it stopped detecting my ethernet cord...I keep plugging it in and out and no detection and then I put it in my girlfriend's macbook and it connects instantly...any ideas?

My daughter is a student at U. Mass. Amherst and she's having the exact same problem with her Dual Core Macbook. It just stopped connecting via Ethernet out of the blue last week.
Her roommate can get on fine with the same jack and cable. Since the port detects when the cable is inserted or removed, that suggests the port itself is ok... right? She can get on via airport elsewhere on campus, but not in her room, so that's a pain.
She's up to date with the latest firmware and OS -- in fact, I updated it over the weekend, not knowing whe was having problems back at school. the folks who run the campus computer support center are apparently not too Mac-savvy.
Were you able to resolve this problem?
Thanks...

Macbook won't detect Acer X193w

I connect my Macbook to an Acer via MDP to VGA, the screen goes blue, and the monitor doesn't detect the macbook. This also occurs when I connect to my TV. Any I deas?

HOW did you connect your MacBook to the Acer? What model MacBook Pro? What adapter do you have?
HOW did you connect to the TV?
Just to clarify... monitors do not detect a computer.... the computer detects the monitor by reading something called the EDID from the monitor which provides information regarding the dimensions and refresh rate, then the computer drives the montor.
Did you select the proper input on the TV to receive the signal from the MacBook Pro? Most TVs hav multiple inputs.

MacBook won't detect projector

Aloha,
I am using a MacBook with OSX 10.4.11. I am trying to get the machine to pick up an external display, a cannon projector via a DVI adapter.
Before I upload the new system on the machine with my preferences I was able to connect and see the external display. I was able to mirror and view it from the projector. I was running leopard then. Since I have uploaded the older system I cannot.
After going into system preference - display it only list 1280x800. It doesn't have a mirroring options or any other options for that matter. I have also tried hitting F7 and it did not work. Also it doesn't pick up the projector at all.
I did turn off both machines before I attached them. I don't not want to upgrade to leopard just yet, I would like to keep the system I have. Please let me know what I can to use the used the projector as another screen. Mahalo.

If it worked under Leopard, there is no reason it shouldn't work under Tiger. I would check and make sure there isn't a cabling problem. And also make sure the projector is set to the correct input.

Macbook won't detect USB input devices

Hi everyone!
I'm desperately browsing the forum threads here for some help but after resetting everything resetable and after all recommended software updates, I still can't get my USB ports to recognize my external mouse/keyboard (Logitech S530 Desktop). Of course, I have also tried several other mice (also wired) but it didn't work either. Though, external HDs and IPod work fine. I quite doubt that it's a hardware problem because after formatting and reinstalling the OS, the ports were working again until I have carried out all the software updates (firmware and so on...). Could it be a driver conflict? Is there someone with the same problem?
I'd really appreciate your help!!!
MacBook (Black) Mac OS X (10.4.7)

I have had a problem that is a little similar. After leaving my computer on and not using it for a few hours I return to find my input devices (keyboard and mouse) not responding. the computer is still perfectly functional, but the USB devices do not work. I have to restart to get them to work again.
Any ideas? It's happened 3-4 times in the past few weeks since I got it. I thought it was just being iffy, but this is a little worrying.
thanks!

My MacBook won't detect some USB devices. HELP

All boxes are checked under Finder>Preferences>General and Finder>Preferences>Sidebar. It shows up when I go Apple Menu>About This Mac>More Info...>USB but not when I check Disk Utility. HELP!
Also, I have OS X 10.6.8

An issue with USB can be almost anything. Check this article from Apple, as it might help you diagnose the problem.

Black 13'' Macbook won't recognize display cable anymore

I have a 13'' black Macbook purchased in fall 2008, running OS X ver. 10.5.8 . I recently cracked my screen and have been relying solely on my HDTV for display. I have used a mini-dvi to dvi, and dvi to hdmi connection for about 2 years with no issues at all. Recently, when I connect to my laptop, the screen goes blue for a couple seconds (as usual) but then fails to recognize my tv as a display. Same hardware has worked flawlessly for almost 2 years and now nothing. I know there are similar threads but I have tried many suggestions with no help. Anyone??

have you tried to power off the TV and try it again?
do you have an extra HDMI cable to rule it out?
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Solution to 'my macbook won't detect my wifi anymore'

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