PC Shuts off When Ethernet cable is plugged in

Dave1117

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Jun 29, 2014
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Just installed my new noctua aftermarket cooler and a new power supply. The pc runs great with temps far lower than my stock cooler could achieve.

The only problem now is whenever I connect my pc to my netgear power line adapter (plugged into the wall outlet) via an ethernet cable, my pc just shuts off within a minute. I took extra care to make sure I was grounded during the installation, didn't put my hands all over the motherboard, opened up the pc and gave all the plugged in cables an extra little push to make sure everything was in.

I will add that my pc has shut off for seemingly no reason before. Last time it happened was weeks ago. I seem to have isolated this problem to the network adapter connected to my motherboard. Wireless internet works, but it's the ethernet that's a problem. It may also be noteworthy to add that the network adapter I have has never really performed very well. It was only about 20 bucks. Would it be wise to just go run to best buy and pick up a new network card and try again?
 
Solution
The power cable comes with the power supply and is therefore part of the assembly. Not plugging the fan into the motherboard would be a fan issue. I see this no differently. In any case, glad to know it was resolved.
Yes. I'd definitely replace it if it's had issues before and is shutting the system down now. You might also want to look to the power supply as a possible issue. Low end or budget power supplies can be very susceptible to changes in power draw from new hardware.
 

Dave1117

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Jun 29, 2014
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I don't know if this is considered low end or budget but it's what I just installed. Recommended through this forum. It's odd how the network adapter starts doing this every time now after installing the cooler and new psu.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151107&nm_mc=KNC-GoogleAdwords-Mobile&cm_mmc=KNC-GoogleAdwords-Mobile-_-pla-_-Power+Supplies-_-N82E16817151107&gclid=CjwKEAjwiZitBRCy0pb3rIbG9XwSJACmuvvzMce_opuC7GGIcQPTowAVmPV9Im-HuiCJa9UcYMN_4hoC5H7w_wcB&gclsrc=aw.ds
 

Dave1117

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The old one was a $40 cheap bestbuy insignia brand psu and it was LOUD. It was only temporary and I still have it. Thing is my new PSU is supposed to be higher quality, and so far my PC is holding up fine under stress while I play battlefield 4. I'm not sure it's the new PSU although swapping back in the old one would be an option. I just hate having to go through that work again.
 
The new PSU is good. M12II is a good unit. It's not due to that. I'm wondering if you may have possibly overtightened the CPU cooler or something. What CPU cooler did you install and did you have to remove the backplate to the cooler, on the other side of the motherboard when you did it or was it the type that just clips on in place of the stock cooler?

It's probably unrelated to those upgrades but I thought it might be worth asking.
 

Dave1117

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The cooler was a noctua nj-u12 s. And yes, the back plate had to come off technically to remove the old cooler. I hope I didn't f something up :( It screws right into the backplate and the directions said "Tighten the screws until they stop" so that's precisely what I did. Didn't tighten them like crazy from what I remember. It's a huge cooler. I used a pee sized thermal paste, removed the old paste with a little bit of 91% alcohol. I mean if everything else is working and only the network card is malfunctioning is that any positive indication for me? lol. I played battlefield 4 for over 3 hours with no issues. Temperatures hardly go above 35c if ever. All fans are running, optical drive works, LED lights work. I also left my pc on for several hours today downloading something and it kept running with no crashes. I simply cannot plug an ethernet cable into my network card which is connected to the motherboard.

An interesting clue here I just remembered though… Wirelessly the card works consistently, but ever since I started using an ethernet to connect my pc I noticed that every hour or so the connection would drop for no reason. I'd have to get on my hands and knees to unplug the ethernet, and plug it back in to re-establish the connection. I do use a power line connected to my outlet for this. For the longest time I thought the power line had the problem, but now i'm thinking it could have perhaps been the network card. What a damn mystery.
 

Dave1117

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Oh golly... So I went to the store and bought a $15 adapter for nothing because upon bringing my pc downstairs to be opened, I noticed the power cable was so loose in the power supply it was practically falling out. I didn't realize it could go in another half inch with a push. So... Problem solved. LOL. Can I make this my answer?