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I had a system that did the same. Turned out to be the motherboard. I first started noticing it when one of the nic ports stopped working. I tore it apart and had it running without a case and noticed that if I plugged a wired cable into the working nic it would die, but if I used the onboard wireless it would work fine. I replaced the board and it has worked fine since.
– Phillip R.
Commented Jun 22, 2012 at 20:30
Don't remember having anything to do with 1394 ever
– Timo Huovinen
Commented Jun 22, 2012 at 20:34
This will also happen if you accidentally install a USB cable into the 1394 slot. FYI. So even if you don't have firewire you can still accidentally screw up your mobo.
– OmnipotentEntity
Commented Jun 22, 2012 at 20:59
I looked at the firewire port, and I am very sure that I never connected any USB's there.
– Timo Huovinen
Commented Jun 23, 2012 at 5:25
I asked everyone in the house if they did that. Yes someone did connect the USB to the firewire port once -_-, will disable all USB/1394 in the BIOS and see what happens.
– Timo Huovinen
Commented Jun 23, 2012 at 5:30

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```
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