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Computer stops detecting ethernet cable

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December 19, 2010 2:52:53 PM

Hello guys,

I have this major problem, it started happening few months ago or so. Sometimes, when surfing the Internet or playing games online, my PC stops detecting the cable. There is a red X mark in lower right corner on the computer icon, and it says 'No connections found'. It starts working again after restarting my PC but it is very annoying - it interrupts any work I am doing at that moment. When it started happening, it occurred once a week or so, but three days ago it started happening way more often, 4-6 times a day.

I've had this PC for over two years, I've built it myself. Here's the specs:

Mainboard : MICRO-STAR INTERANTIONAL CO.,LTD MS-7376
Chipset : AMD 790FX
Processor : AMD Phenom X4 9550 @ 2200MHz
Physical Memory : 4096MB (4 x 1024 DDR2-SDRAM )
Video Card : NVIDIA GeForce 8600 GT
Hard Disk : Seagate ST3500320AS ATA Device (500GB)
DVD-Rom Drive : Optiarc DVD RW AD-5200A
Monitor Type : Samsung SyncMaster - 20 inches
Network Card : Realtek Semiconductor RTL8168/8111 PCIe Gigabit Ethernet Adapter
Operating System : Windows 7 Ultimate Professional Media Center 6.01.7600 (32-bit)
DirectX : Version 11.00

I've reinstalled windows last week in hope to fix it, but it didn't work, still happening. PC is clean from dust as well, I clean it every saturday. I really hope you can help me guys :sweat: .
December 19, 2010 6:01:37 PM


In the device's Properties in Device Manager, check the Power management tab to make sure the system isn't allowed to turn it off to save power.

It's also worth checking that the cable isn't being fouled somewhere along the way - a piece of furniture standing on it and crushing it, perhaps.

December 20, 2010 4:01:37 AM

Cable is fine, it's going under a wall, I don't think it might be the problem, since it starts working without even touching it after restarting PC, and once I wondered if it is going to come back by itself - waited around 8 hours, still cannot find a connection.

There is no power management tab in device manager, maybe you meant control panel? There it was set to balanced, I've set to it high, might fix it. Would be a silly problem then :ange: .

Guess I'll wait and see, and I'll report if it happens again or not!
Related resources
December 20, 2010 6:20:34 AM

Sunius said:

There is no power management tab in device manager



Sorry - my fault for being less than specific - when I am I get told I'm writing to much :D .

Power Management is a tab in Device Manager if you go to the relevant device and click to see its Properties. Power Management i sthe last tab on the right - click that and untick "Allow the computer etc", then click Apply and OK.

December 20, 2010 6:22:46 AM

anderson9731 said:
A disadvantage of using an Ethernet crossover cable is that the two machines are joined by a physical cable so they must be in fairly close proximity.



I can't disagree but that isn't the case here, anderson9731. Sinius' ciomputer is conneccted by cable to his Router or MODEM.

December 20, 2010 10:30:20 AM

Saga Lout said:

Sorry - my fault for being less than specific - when I am I get told I'm writing to much :D .

Power Management is a tab in Device Manager if you go to the relevant device and click to see its Properties. Power Management i sthe last tab on the right - click that and untick "Allow the computer etc", then click Apply and OK.



Okay, I was kinda shocked there was such an option, why would you want to save power? o.O

Anyway, I unticked all boxes, I will report if it's fixed.



Quote:
Hi Sinuis

Go to the cmd prompt and enter the following

ipconfig /all

copy and paste it here



Sorry, but you wanted me to copy when the connection stops getting detected or just now?

Did it now:

Quote:

Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\Tautvydas>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Tautvydas-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8168B/8111B Family PCI-E Gigab
it Ethernet NIC (NDIS 6.20)
Physical Address. . . . . . . . . : 00-1D-92-B0-AC-90
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::bdb9:550f:74f3:D cfa%11(Preferred)
IPv4 Address. . . . . . . . . . . : 87.247.75.122(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Monday, December 20, 2010 11:46:54 AM
Lease Expires . . . . . . . . . . : Monday, December 20, 2010 3:46:54 PM
Default Gateway . . . . . . . . . : 87.247.75.1
DHCP Server . . . . . . . . . . . : 217.17.85.157
DHCPv6 IAID . . . . . . . . . . . : 234888594
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-58-40-48-00-1D-92-B0-AC-90

DNS Servers . . . . . . . . . . . : 217.17.85.1
217.17.85.2
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{6BCEBA5F-FFDB-4972-89A3-3D9AE60907EE}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:cde:317:a808:b485(Prefer
red)
Link-local IPv6 Address . . . . . : fe80::cde:317:a808:b485%13(Preferred)
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter 6TO4 Adapter:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2002:57f7:4b7a::57f7:4b7a(Preferred)
Default Gateway . . . . . . . . . : 2002:c058:6301::c058:6301
DNS Servers . . . . . . . . . . . : 217.17.85.1
217.17.85.2
NetBIOS over Tcpip. . . . . . . . : Disabled
December 20, 2010 11:13:29 AM

If you can, try a different cable. The cable may not appear to be physically damaged but could be anyways.
December 20, 2010 11:37:18 AM

Psychoteddy said:
If you can, try a different cable. The cable may not appear to be physically damaged but could be anyways.



I don't have such a availability, since my Internet Provider has the modem locked up in the basement and I don't have physical access to it..
December 20, 2010 12:25:01 PM

Powersave solved nothing, it happened again. Did cmd ipconfig /all, and here's the results:

Quote:
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\Tautvydas>IPCONFIG /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Tautvydas-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8168B/8111B Family PCI-E Gigab
it Ethernet NIC (NDIS 6.20)
Physical Address. . . . . . . . . : 00-1D-92-B0-AC-90
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{6BCEBA5F-FFDB-4972-89A3-3D9AE60907EE}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

C:\Users\Tautvydas>



For some reason I couldn't edit my last post and post it in there..
December 20, 2010 5:57:11 PM

Sunius said:
I don't have such a availability, since my Internet Provider has the modem locked up in the basement and I don't have physical access to it..


You should probably call your ISP to troubleshoot then. You're going to be very limited with your options here. :( 
December 20, 2010 6:50:07 PM

I've just bought a new network card, thought old one may be damaged somehow (dust, humidity, voltage jumps, etc., just guessing). Paid 5 euros for it, and will see if it helps. If it doesn't I will call my ISP.
December 21, 2010 4:55:45 AM

Sunius said:
I've just bought a new network card, thought old one may be damaged somehow (dust, humidity, voltage jumps, etc., just guessing). Paid 5 euros for it, and will see if it helps. If it doesn't I will call my ISP.


[#005ff]If that doesn't make a difference, can you check that cable by inviting a friend round with a laptop?

I'm rather intrigued by your ISP's ability to lock up part of your house - is this an apartment block? If so, doesn't anyone else have a problem?

I'm also a little concerned about the length of the Lease you hold over your connection - it's one of the shortest I've ever seen. If you're confident of going in to the router to change that, post back for some details of how to do it.
[/#005ff]
December 21, 2010 10:14:30 AM

Saga Lout said:
[#005ff]If that doesn't make a difference, can you check that cable by inviting a friend round with a laptop?

I'm rather intrigued by your ISP's ability to lock up part of your house - is this an apartment block? If so, doesn't anyone else have a problem?

I'm also a little concerned about the length of the Lease you hold over your connection - it's one of the shortest I've ever seen. If you're confident of going in to the router to change that, post back for some details of how to do it.
[/#005ff]



Will do the first part.

Well, I live in one of those (http://img152.imageshack.us/img152/3114/stgelv6pr.jpg). It's like big house, with 54 apartments and 9 floors. So yeah, there are parts of the house I don't have access to.

What's a lease? What happens when it ends?

And I am not quite sure it's legal to do it, it's probably locked up..
December 21, 2010 5:51:12 PM

Sunius said:
Will do the first part.

Well, I live in one of those (http://img152.imageshack.us/img152/3114/stgelv6pr.jpg). It's like big house, with 54 apartments and 9 floors. So yeah, there are parts of the house I don't have access to.

What's a lease? What happens when it ends?

And I am not quite sure it's legal to do it, it's probably locked up..




You#'re right - you woldn't get near the settings. The Lease is similar to the agreement you have with your Landlord - when it runs out, you're offline until you renew. It's an automatic thing but yours was only granted for four hours and it made me think it might be part of the problem. I still think you should speak with some neighbours to see if they have problems. If the ISP is providing the service to the block owners, they may have done a cheap deal. One neighbour playing a game online could be enough to know another six off the net.

If I suggested a speedtest, how did it come out? If I didn't, try http://www.speedtest.net, zoom in on Lithuania for the local server and click to take the test. |When it finished, click on Forum link and paste the result back here.

December 21, 2010 6:54:31 PM



BTW, how did you find out I was from Lithuania? :S
December 22, 2010 5:16:21 AM

Psychoteddy said:
:o  OH. MY. GOD. :o 

I would KILL for network speeds THAT fast! Holy Jesus' Mother of GOD's COUSIN TWICE REMOVED!!!



You'd move that decimal a couple of places to the right to get close to mine. Surely that cannot be right.

December 22, 2010 5:22:45 AM

Sunius said:
]http://www.speedtest.net/result/1079940203.png

BTW, how did you find out I was from Lithuania? :S



I'm a bit of an amateur linguist with a history of dealings in Eastern Europe so your name was a bit of a giveaway. I could have tracked the 217. DNS address from the ipconfig report and I expect that would have shown up in that part of the world.

The speed is incredible - I wasn't aware speeds of that level were even attainable. In the Third World Broadband country of England in which I live, I am told I should consider myself lucky to be given 1.7Mb. You could share that speed with a couple of hundred families without loss of service so my theory has gone out of the window.

There is no need to take the test with a laptop to confirm your cable is alright if that speed can get down it but it would still be worth trying it. The answer to this problem must lie in something in your system throttling the speed so results form another system would be useful. Which browser do you use?

December 22, 2010 7:41:15 AM

Saga Lout said:

I'm a bit of an amateur linguist with a history of dealings in Eastern Europe so your name was a bit of a giveaway. I could have tracked the 217. DNS address from the ipconfig report and I expect that would have shown up in that part of the world.

The speed is incredible - I wasn't aware speeds of that level were even attainable. In the Third World Broadband country of England in which I live, I am told I should consider myself lucky to be given 1.7Mb. You could share that speed with a couple of hundred families without loss of service so my theory has gone out of the window.

There is no need to take the test with a laptop to confirm your cable is alright if that speed can get down it but it would still be worth trying it. The answer to this problem must lie in something in your system throttling the speed so results form another system would be useful. Which browser do you use?



Well, my actual plan says 100 Mb/s in my country and 6 Mb/s in other countries. I pay 12 euros/month for it. Anyway, I am using firefox. When I replaced my network card 2 days ago, the problem hasn't occurred yet! I hope it fixed it :) 
December 22, 2010 5:37:03 PM

Sunius said:
I pay 12 euros/month for it.




That's enough now - far too much for an old man to take. MODERATOR!!! :D  :D 



December 23, 2010 7:41:30 AM

Fine fine. Problem is fixed, and since my network card was part of my motherboard, I think I am gonna give it to warranty guys, since it's still good for 1 year. Maybe there's another defect in it as well...
December 23, 2010 7:09:34 PM


Good idea - once one element goes, others may well follow. Glad you sorted it in the end.

!