PC Shutting down randomly and ethernet port not responding.

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mercturq

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Nov 8, 2013
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It started when my PC just decided it wasn't going to load POST. Frustrated, I decided that I would deal with it later. Then 2 days later, I decide to get to it. I did absolutely nothing to it and just turned it on. It now decided it was going to load everything fine except now my Ethernet port is not registering. There is no flashing light on it and it is not even an option to disable/enable it in my network options. There is also random crashes (as if someone pulled out the plug to my PC). I thought it may be PSU issues, so I was monitoring my voltages, but they all seemed fine.

Then I thought it was my CPU overheating, so I first checked the cooler which was working fine, then I reapplied thermal paste. Finally, I reset CMOS just in case. Nothing seemed to work. Still ethernet port not registering and random crashes. Anyone have any ideas?
 
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Darkbreeze

Darkbreeze

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You can start by downloading HWinfo, running "sensors only" and posting screenshots of all the sensor readings. It will probably take three screenshots to capture all the sensors as you'll have to scroll down the page several times to get them all. You can upload the images to tinypic.com or another image hosting service and then post the links to those images here surrounded by the following method.

qn8gox.jpg
 
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Darkbreeze

Darkbreeze

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This is a problem. I don't know for CERTAIN that it's what's causing the shut downs and other issues, but it certainly could be and it is almost certainly an indicator of a problem with the unit. 12v should never drop below 11.7v at the lowest under load in my opinion. It could however simply be the utility not reading the sensors correctly, but since it shows a much higher average and current reading, I suspect it's probably accurate and could even be worse than what's reported here since sensor readings using software rather than actual voltage testing equipment is an estimation based on sensors rather than a true reading of actual voltage. What is your PSU model number and brand?


2qakz1e.jpg

 
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Darkbreeze

Darkbreeze

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If it's still under warranty I think I'd contact Corsair and tell them your unit is going out of spec on the 12v rail with an 11.6v reading and causing problems. If you cannot get an RMA, or just want to get a better unit (The Corsair CX, CS, RM and VS units are just NOT good. They don't have very good longevity due to the design and capacitor selection.) then let me know and I'd be glad to make some recommendations.

The power supply MIGHT not be the problem, but it's going to be seriously difficult to determine if something else is the problem if you have a supply voltage that's going out of spec and creating havoc with all the rest of the hardware, plus, it's likely that it IS the problem, when the sensor readings drop that far, that quickly.
 
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mercturq

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I changed out the power supply and it was able to turn on properly and load everything.. Though Ethernet port still not registering and still shutting down randomly. Does this guarantee the problem to be the motherboard?
 
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Darkbreeze

Darkbreeze

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Well, it doesn't guarantee it but it sure makes it a whole lot more likely. Depending on what model of power supply you change to, it could actually still be a power supply issue. Clearly some if not all of the problem was PSU related, and if you replaced it with another unit that was maybe a poorer choice than what you had, it could still be a problem.

Since you're having issues with some of the onboard features of the motherboard though, I'd suspect that perhaps you're right. I'd breadboard it just to make sure it isn't something else like a pooched drive or bad stick of RAM.

http://www.tomshardware.com/faq/id-1753671/bench-troubleshooting.html
 
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mercturq

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I decided I did enough messing around with all the other parts and just replaced the motherboard. Turns out it was exactly that. All issues have been cured. My guess is I had a faulty power supply (it was Corsair Gold standard which surprised me it would be faulty) and it took the motherboard with it.
 
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