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MacBook Pro Ethernet Issue - Page 2

post #11 of 27
Thread Starter 
Quote:
Originally Posted by Lord Xeb View Post

Hm... This is a puzzling one. I would try the following:

Create a new location under Network Preferences.
Reset the PRAM and SMC (to reset the SMC, turn off the machine, then press and hold the power button. Keep holding till the light flashes quickly and the machine will turn on).
Perform the aforementioned bluetooth trick.
If none of those work then I would also try removing the System Configuration folder in /Library/Preferences.

This will cause your system to forget all wifi networks and network configs but I have had it resolve odd issues.

Also repair the permissions on your system. That sometimes fixes odd things as well.

However, as far as the ethernet port goes, usually when it stops working it is a logic board that requires replacement. And those are not cheap... usually 350-450 bucks depending where you get one. PowerBook Medic is a good site for find parts if you need them.


Disconnecting and reconnecting of Wifi can also be caused by a poor wifi signal. You can actually measure this with some magic that is in OS X itself. To do this, press and hold the option key and click on the wifi symbol on the menu bar. Select Wifi diagnostics.

If you select Performance in the tool, it will actually measure the signal strength. However, this feature has since been removed in Mavericks and above. frown.gif

Currently working through your possible fixes, cleared SMC and PRAM, added a new location. I also unchecked the "Wake for network access' option in Energy Saver as some research has suggested it.

Looking at the front of my network switch, I noticed that the activity light briefly illuminates, then flashes twice (as if sending some discovery packets), and turns off and repeats the process. It realizes there is something hooked up, but the NIC in the MacBook doesn't want to start a connection.

Going to mess around with the bluetooth fix and update this post.

Update: Removing bluetooth plist and letting it rewrite itself had no effect, though messing with it stabilized the Wifi connection, it seems. At this point I am really hoping its not the logic board because that is certainly an expense worth more than the computer itself.


Fixing disk permissions and will move onto fixing User Directory Permissions and ACLs. If NONE of this works, I am going to run AHT and see if it gives me anything informative.
Edited by raidmaxGuy - 9/29/15 at 9:07pm
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post #12 of 27
Quote:
Originally Posted by raidmaxGuy View Post

Currently working through your possible fixes, cleared SMC and PRAM, added a new location. I also unchecked the "Wake for network access' option in Energy Saver as some research has suggested it.

Looking at the front of my network switch, I noticed that the activity light briefly illuminates, then flashes twice (as if sending some discovery packets), and turns off and repeats the process. It realizes there is something hooked up, but the NIC in the MacBook doesn't want to start a connection.

Going to mess around with the bluetooth fix and update this post.

Just want to re-itterate a part that @Lord Xeb said since you didn't mention trying it. Deleting the system preferences does work wonders in many cases. Exact reason why are hard, but sometimes teathering drivers and or VPN connections can mangle up the network settings file.
When working at Uni a number of issues were resolved by either doing that or doing a reinstall on-top of the existing os.

p.s. For OS X you can reinstall the operating system right on top of all your data. Just don't format the HDD and it will migrate everything pretty flawlessly. Obviously just in case back up important files you can't lose but anecdotally I never had data loss issues with the re-intall method to reset internal system stuff.
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post #13 of 27
Thread Starter 
Quote:
Originally Posted by andrewq2 View Post

Just want to re-itterate a part that @Lord Xeb said since you didn't mention trying it. Deleting the system preferences does work wonders in many cases. Exact reason why are hard, but sometimes teathering drivers and or VPN connections can mangle up the network settings file.
When working at Uni a number of issues were resolved by either doing that or doing a reinstall on-top of the existing os.

p.s. For OS X you can reinstall the operating system right on top of all your data. Just don't format the HDD and it will migrate everything pretty flawlessly. Obviously just in case back up important files you can't lose but anecdotally I never had data loss issues with the re-intall method to reset internal system stuff.

I actually just tried that, and nothing. I can verify that my VPN is gone, but it just sounds weird that this would hamper link activity altogether. It looked like it went away after I deleted the folder, but I will check again. Also, this is a shared laptop, and I am not sure if settings are preserved when you reinstall the OS? The other person that uses it was pretty fussy about losing any settings, etc. etc. etc. We've had it a little over a month and the OS was clean installed before we got it.


Edit: To clarify, I have done everything on the list. System Profiler shows a network card on the PCI bus, indicating that it /should/ be at least functional to the point the computer knows of its existance. I am going to run AHT. I did clear SMC again, but this time using the Shift+Command+Option+Power method, magsafe charger reset, indicating that it did actually reset. I am out of ideas here frown.gif

I have a USB to ethernet adapter (trust me, it isn't an Apple one, so I get a blistering 5mbps on it). I don't want to have to use it.... Need to find the solution

Also, for no reason I got a reboot because a problem was encountered message. This is starting to look more and more hopeless. It mentions iokit.iokitnetworkingfamily encountered some sort of kernel panic. This COULD be from the USB ethernet adapter, as I just installed the software for it.
Edited by raidmaxGuy - 9/29/15 at 9:57pm
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post #14 of 27
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I can't get AHT to go, I made an install USB using TransMac, and well, it won't boot from it. Therefore, I can't run any diagnostics.


Edit: I am leaning heavily to a hardware fault. It seems like it's independent of the OS, Ubuntu doesn't seem to make any difference. I will try more when I'm not burned out.
Edited by raidmaxGuy - 9/30/15 at 2:13am
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post #15 of 27
If you tried Ubuntu and that did not work, then you are looking at a hardware issue. I second all the troubleshooting mentioned above and your last test confirms hardware issues in my mind. Sorry sir... frown.gif
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post #16 of 27
Thread Starter 
Quote:
Originally Posted by KyleMart06 View Post

If you tried Ubuntu and that did not work, then you are looking at a hardware issue. I second all the troubleshooting mentioned above and your last test confirms hardware issues in my mind. Sorry sir... frown.gif

Well, I'm not so sure, I was having issues with the Ubuntu USB i had made, so I will be trying it again. I still cannot understand why it decided to work with no fuss for the repair guys... It's either intermittent hardware problems, or, not really a hardware problem, but something low-level enough it seems like it could be? I would take it to our Apple dealer but they charge $100 for a diagnostic. I guess they know people will pay crazy amounts of money for anything under the realm of Apple.
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post #17 of 27
Quote:
Originally Posted by raidmaxGuy View Post

I can't get AHT to go, I made an install USB using TransMac, and well, it won't boot from it. Therefore, I can't run any diagnostics.


Edit: I am leaning heavily to a hardware fault. It seems like it's independent of the OS, Ubuntu doesn't seem to make any difference. I will try more when I'm not burned out.

To reinstall all you need to do is hold Command + R on boot, you shouldn't need to make an external disk.
Apple KB article: https://support.apple.com/en-us/HT201314
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post #18 of 27
Thread Starter 
Quote:
Originally Posted by andrewq2 View Post

To reinstall all you need to do is hold Command + R on boot, you shouldn't need to make an external disk.
Apple KB article: https://support.apple.com/en-us/HT201314
This happens when it tries verifying my installation eligibility.....





No chance of restoring the OS? Is this indicative of a serious OS corruption?
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post #19 of 27
Thread Starter 
I went back to the helpdesk today, they tested the computer in several locations in their office, it worked fine each time. I am currently in the same building a few floors up and it is not working. In fact, the system just crashed while i was trying to use my USB adapter. This adapter is connected to the network but again, has developed the symptoms of the actual ethernet port on the computer. It says it is not connected. While I was trying different USB ports, the system crashed and I can very well assume it has to do with the networking module in OS X. The only thing left to try is a format and reinstall. The wifi has started to cut out again. Everything is pointing to system level software being broken?
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post #20 of 27
Quote:
Originally Posted by raidmaxGuy View Post

This happens when it tries verifying my installation eligibility.....





No chance of restoring the OS? Is this indicative of a serious OS corruption?

Quote:
Originally Posted by raidmaxGuy View Post

I went back to the helpdesk today, they tested the computer in several locations in their office, it worked fine each time. I am currently in the same building a few floors up and it is not working. In fact, the system just crashed while i was trying to use my USB adapter. This adapter is connected to the network but again, has developed the symptoms of the actual ethernet port on the computer. It says it is not connected. While I was trying different USB ports, the system crashed and I can very well assume it has to do with the networking module in OS X. The only thing left to try is a format and reinstall. The wifi has started to cut out again. Everything is pointing to system level software being broken?

Hmmmm, this is weird. Is your college bookstore or Help-Desk an Apple Service Provider? If they are they can run AST and more advanced tools on it or even do Net installs from their local OS X Server. The only kind of hardware issue I know of that would spread would be water damage. The easiest way I know for you to install over besides the restore option would be to download the newer OS X installer from the app store. Could you post the kernel panic *.panic file? You should be able to find it in the Console app in the Utilities folder. @Lord Xeb I'm stumped... It seems like hardware, maybe bad HDD but then it seems like software too o.o
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