Ethernet not working on motherboard

edited March 2015 in Hardware
Asking here in hope of answers. My motherboard (an Intel DQ45CB) has non-functional Ethernet since I changed cases. It acts like no cable is plugged in. Sometimes it'll even change link state, with or without a cable plugged in. The lights on the back of the port don't seem to light up either. Any ideas?

Comments

  • The only thing that springs to mind is possibly the ground tab on the IO shield isn't resting on the port like it's supposed to. But I'm not even sure if this would have any effect. Apart from that, you may have knocked it and broken some solder joints.
  • The USB ports on the same block work. I don't think I've seen a single port with the shield ground touching in any computer I've seen, so likely not that.
  • The ground tab isn't bent into the port, is it? I've seen that before.

    Otherwise, I'd say maybe you knocked it loose when changing the case. Take the board out and inspect the solder joints.
  • ampharos wrote:
    Asking here in hope of answers. My motherboard (an Intel DQ45CB) has non-functional Ethernet since I changed cases. It acts like no cable is plugged in. Sometimes it'll even change link state, with or without a cable plugged in. The lights on the back of the port don't seem to light up either. Any ideas?

    Gonna ask an obvious question here; Is it a cheap case you're using?
  • BlueSun wrote:
    The ground tab isn't bent into the port, is it? I've seen that before.

    Otherwise, I'd say maybe you knocked it loose when changing the case. Take the board out and inspect the solder joints.

    I've had that happen with another board, in which case I snapped the tab out and it works. I don't think it's the joints, as the USB ports on the same block work fine.
  • ampharos wrote:
    BlueSun wrote:
    The ground tab isn't bent into the port, is it? I've seen that before.

    Otherwise, I'd say maybe you knocked it loose when changing the case. Take the board out and inspect the solder joints.

    I've had that happen with another board, in which case I snapped the tab out and it works. I don't think it's the joints, as the USB ports on the same block work fine.

    The USB ports don't use the exact same solder points though. It's possible it's just partially damaged.
  • I checked in Ubuntu, no link there either. (Some people I asked thought it was driver issues. Ha!)

    Will check the joints later.
  • Bet the board is shorting out on the bottom somewhere. Maybe a standoff is sitting in a wrong spot and causing a short or a lost screw go stuck under the board.
  • I actually had that stop the board from working completely. Removed that standoff, the board (except Ethernet) works.
  • Probably fried the ethernet when that happened. Might have to disable it in the BIOS/EFI and use a add-in card.
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