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MacBook Pro Ethernet Issue

post #1 of 27
Thread Starter 
I have a 17'' Early-2009 MBP that seems to have a strange issue with ethernet, and was wondering what the heck is causing it.

When I connect a cable to it (doesn't matter what cable or port, onto my home or campus network, it tells me the cable is unplugged). I started to suspect that perhaps it was a hardware problem and ran it down to the computer helpdesk. They plugged it into their local network and the ethernet started working immediately. So I've confirmed it's functional and made myself look like an idiot in the process.

Is this perhaps some sort of configuration/software issue? Would clearing PRAM possibly solve the issue? Am I missing something? I turn off the wifi when I connect the cable and it just doesn't do anything. The guy at the helpdesk demonstrated that it probably isn't a hardware fault.


I need a solid LAN connection to do TelNet to our z System mainframe, any slight interruption on the wifi (which believe me it is not reliable), will lock up my session and I have to wait 10 minutes to log back in. I can't work like this.


Please advise, thanks in advance.


Note: (I couldn't decide if this should go under networking, laptops, or Mac. I chose Mac because the people looking here would probably know the particulars about the software and hardware used for networking. Sorry if this in the wrong place.)


Edit: Also, my wifi disconnects and reconnects frequently, interrupting my connection and pages don't load, or video streams will stop.
Edited by raidmaxGuy - 9/29/15 at 11:55am
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post #2 of 27
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Perhaps the great and powerful @Lord Xeb could solve this mystery.
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post #3 of 27
Are you running Yosemite?

If so, your not alone with Ethernet issues. Strange, but try to remove Bluetooth

http://ihealthgeek.com/2015/02/yosemite-10-10-2-wifi-and-bluetooth-finally-solved-no-really/
post #4 of 27
Thread Starter 
Perhaps the great and powerful
Quote:
Originally Posted by LazyBoyZ06 View Post

Are you running Yosemite?

If so, your not alone with Ethernet issues. Strange, but try to remove Bluetooth

http://ihealthgeek.com/2015/02/yosemite-10-10-2-wifi-and-bluetooth-finally-solved-no-really/


Actually, I failed to mention I am running 10.8.5 (because it runs faster than 10.9 or 10.10 on my computer)

However, reading this article, I must also add that my wifi does disconnect and reconnect fairly regularly.

I removed Bluetooth PAN as per the guide and will test the Ethernet later, will also watch wifi connection. Who uses a Bluetooth Personal Area Network nowadays anyway? If I continue to have problems, I may delete the bluetooth plist and let it get rebuilt.
Edited by raidmaxGuy - 9/29/15 at 11:58am
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post #5 of 27
Have you tried bouncing the interface while it's connected?
post #6 of 27
Thread Starter 
Quote:
Originally Posted by sub50hz View Post

Have you tried bouncing the interface while it's connected?
ifconfig shows that the adapter is inactive and has no IP, indicative of it not detecting a cable.

netstat -r shows no active connections on interface en0 (ethernet)
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post #7 of 27
Have you already tried resetting SMC?
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post #8 of 27
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
 
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post #9 of 27
Quote:
Originally Posted by Lord Xeb View Post

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

I'm running a Macbook Pro 12,1 on Yosemite and the Tx rate is there when I hold option and press the wifi icon.
Sabertooth
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Sabertooth
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CPUMotherboardGraphicsRAM
Intel Core i7 4770k @4.5 GHz Asus Z87 Pro PowerColor R9 290X BF4 Edition Corsair/G.Skill 16GB @ 1600 
Hard DriveHard DriveHard DriveHard Drive
Sandisk Ultra Plus 256GB WD1002FAEX Caviar Black 1TB  Samsung HD502HJ 500GB Samsung HD501LJ 500GB 
Optical DriveCoolingOSMonitor
Lite-ON 24X CD/DVD Burner  Antec H20 620 w/ AP-15 Push-Pull Windows 7 Pro  Acer G276HL 27" 
KeyboardPowerCaseMouse
Das Keyboard Pro w/ MX Blues Corsair HX850 Cooler Master HAF 922 Microsoft IE 3.0 
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Steelseries Qck 
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post #10 of 27
Huh? Okay them. Learn something new!
 
Gsvlip Dudyrm
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Oda'maksv
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Gsvlip Dudyrm
(15 items)
 
Oda'maksv
(9 items)
 
CPUMotherboardGraphicsRAM
3770k @ 4.5 1.312 load Zotac Z77 ITX Wifi GTX 1070 Gaming 2126/2249 w/ Hybrid cooler TridentX 16GB 2400MHz 
Hard DriveHard DriveCoolingCooling
Samsung 850 Pro 1TB Seagate 2TB H105 EVGA Hybrid GPU cooler 
OSMonitorKeyboardPower
Windows 10 Asus MG279Q - 24" 144Hz 1080p Filco Majestic II w/ Cherry Reds Seasonic X 760W 
CaseMouseMouse PadAudio
Bitfelix Prodigy Logitech G400 Razer Goliath AKG A701 
AudioAudio
JDS Labs Objective 2 JDS Labs ODAC 
CPUMotherboardGraphicsRAM
Core i5 750 3.99 (190x21) 1.376v Load ASUS P7P55d-E Pro GTX 670 FTW <- Poor overclocker :( 8GB (4x2GB) G.Skill DDR3 1600 
Hard DriveHard DriveOptical DriveOS
Samsung 830 Evo 128GB 2x 2TB  Some DVD drive OSX 10.10.4 
MonitorPowerCaseMouse
Asus 1080P Crap TX 750 HAF 922 G400s 
Mouse PadOther
Apple Keyboard Xbox One controler 
CPURAMHard DriveHard Drive
C2D 2,26GHz under volted @ .978v 8GB  Crucial M4 64GB SSD 500GB Scorpio Black 
OSMonitorKeyboardMouse
OS X 10.0 1280x800 Built-in Trackpad 
Audio
Built-in 
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Reply
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