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A friend of mine asked me to help him with his network, strangely his ADSL modem always disconnects whenever he plugs in his computer. But as long his computer is offline the modem works just fine for wireless or wired connections from other devices.

Things we tried:

  • Reinstall windows (XP & 7 both tried)
  • Change Ethernet cable
  • Change physical port on router
  • New network card
  • Different power sources, current stabilizer (not sure about the correct term)

Yet, the router insists on not letting the internet work: the ADSL lamp turns off as soon the computer is plugged in and so does the internet lamp (accessing the router page works though). We even tried connecting a different pc in his room to rule out that his room is haunted or something (it wasn't and the other pc worked).

What can be the cause of this? the router is a "ZTE ZXV10 W300" (English Manual)

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  • they are already connect to different power points, we also tried getting a current stabilizer (not sure about English name)
    – a3f
    Feb 22, 2013 at 12:04
  • Yes, the router remains on, just the ADSL/Internet lamps turn off (I edited the question)
    – a3f
    Feb 22, 2013 at 12:08
  • As I said as soon it's connected whether u plug it in while it has already booted into windows or you plug it in while it's booting up. As soon you turn the pc on, the lamps go off.
    – a3f
    Feb 22, 2013 at 12:11
  • Oh, I'm sorry, I may have miss-read. So, I hope the last question. If the PC is on, with wireless turned off and no cable connected to the router, does the router remain functioning?
    – Dave
    Feb 22, 2013 at 12:13
  • Yes, as long you don't connect them the router works. Thanks for taking time to help :)
    – a3f
    Feb 22, 2013 at 12:15

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