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Solved Strange ethernet connectivity problems

Micro-star international 760gma-p34 fx d...
March 30, 2017 at 11:34:35
Specs: Windows 7 64 bit, 3.601 GHz / 16324 MB
Hi All,

We are experiencing a very strange issue with a PC and an Ethernet connection, I hope someone can help us figure out what is going on.

My friend has a PC with the following specifications

MSI 760GMA-P34 (FX) motherboard
AMD Processor (not sure which one)
8GB of RAM
CIT 500 watt PSU
Windows 7 64 bit

He currently has Sky broadband,

I plug in an Ethernet cable into router and into the PC, nothing happens, no activity lights nothing. PC doesn't even try to detect the cable, usually you bet a circle egg timer over the network icon is system tray but on this pc it only has a red cross.

If I plug that same cable immediately into a laptop, PlayStation or Xbox I have internet almost immediately.

Now here is the weird part.

If I plug this cable into a Netgear 5 port switch, then plug that switch with another Ethernet cable into the PC it has immediate internet.

I cannot seem to figure this one out, at first I suspected the cable from the router but it works fine in all other devices, so then I suspected the Ethernet port on the motherboard but that works when plugged into a switch.

Does anyone have any ideas of what I should be looking out for or what I can try?

Many thanks,


message edited by AlwaysWillingToLearn

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March 30, 2017 at 11:53:07
I'm wondering if you have a little oxide on a plug and/or socket - it can be about invisible.

This can affect the connections because it ends up in a slightly different position in each situation. Try popping it in and out quite quickly at least 12 times at both the router and PC ends to help burnish the contacts. You could also try another cable just in case it has an intermittent fault.

Always pop back and let us know the outcome - thanks

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March 30, 2017 at 16:54:40
✔ Best Answer
I assume you are using a strait Ether cable.
In My opinion, either the PC NIC-port or the router port does not have auto-sense feature or it is not activated.
Try using an Ethernet cross-cable between PC and router.

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March 30, 2017 at 19:27:54
I was also thinking that it is an auto-sense issue which the switch has and one or neither of the others apparently have. Using the cross cable, the switch, or replacing the NIC in the computer with one that does appears to be your option. The router might have a setting to turn it on and off but I have not seen this before and it is unlikely that the NIC card or onboard NIC has the software option.

You have to be a little bit crazy to keep you from going insane.

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March 31, 2017 at 00:13:08
Brilliant suggestions guys thank you, I have spoken with my friend and he confesses (only now) that just before this happened he has pushed his pc back against the wall which pushed the Ethernet cable right into the motherboard socket. That's when the internet stopped working,

As this the socket which is built onto the board, it isn't an easy replacement, i used a cheap TP-Link PCI-E Ethernet card but the speed was very poor, the work around for us right now is the 5 port switch.

I think you guys are right, the auto sense does seem very plausible, i think the router (if the setting is available on it) will have auto sense on as the laptop and other devices work.

I think he has damaged the port when he pushed the pc back, i'll check the bios for auto sense if such feature exists, if not then i may just leave the switch in place but i will use a cross cable just to see what happens.

Thank you everyone for your help and suggestions much appreciated.


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March 31, 2017 at 06:31:52
Good NIC cards are not expensive so a more permanent fix if you plan on keeping the machine would be to purchase a new card and install it. Make sure that you disable the internal one in the BIOS to be sure there is no conflict or other issues as well as removing it in device manager (though disabling it there might also work).

You have to be a little bit crazy to keep you from going insane.

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