We had a storm over the weekend with lots of lightning, I was out of town when it came through, but when I returned home I found our AT&T router would not turn on and had apparently been damaged by some sort of power surge during the storm, along with a couple of cable boxes. Now that all of those items have been replaced, my computer is still saying that the network cable is unplugged, but the internet works fine on every other computer in the house.
Is it possible that the power surge damaged the onboard ethernet portion of my motherboard?
Go to windows control panel and check the device manager under "system". If your lan device is disabled, it will have a mark next to it in the hardware section, and you can try reinstalling the device driver. If all is well, then try a cheap pci lan card. I got one for 88 cents on sale at frys electronics. The regular price is about $6. It's cheaper than replacing the motherboard.
A card is cheaper than the mobo, but if lightning croaked your ethernet port, the possibility of other damage can't be overlooked. I'd consider this a short term solution, as you may need a new mobo anyway.
They cost a little more, but if your router is wireless, consider a wireless adapter. That way, even if you ultimately replace the mobo, you have added a capability you wouldn't otherwise have.
I installed an ethernet card and everything was working again. Now today my computer has become completely unstable. It has been locking up or crashing about a minute or two after startup. I'm guessing that the motherboard suffered other damage from the lightning, and its just beginning to show up.
Would you agree? Should I replace the motherboard?
I'm guessing that the motherboard suffered other damage from the lightning, and its just beginning to show up.
Entirely possible; transistor 'junction punctures' due to high dV/dT can be small enough to allow the transistor to work - but leakage across the 'hole' will degrade it worse over time; just a guess - we can do some more troubleshooting, but will need more comprehensive info on your actual hardware; always possible you've got a stick of RAM that's 'going', too...
Component-level diagnosis and repair on a multi-level motherboard is almost certainly beyond the capacity of any equipment you are likely to have. I certainly don't have it, and other than obvious, visible damage to easily accessible components, this kind of repair isn't something I'd consider even remotely likely to succeed.
alright, i know this thread is 6 months old however, i was having this issue and i finally fixed it. The problem was that the ethernet port in the back is nvidia thus it needs the nvidia ethernet drivers. I installed this and it worked instantly. I hope this helps anyone to is having trouble.