if I turn on a device from the wall socket the HUB turns off and then back on again,is that normal..?

It did come with a power adapter but that got damage so its not powered,only powered by the PC.

  • It is not normal, but you should probably call an electrician or use a different wall socket for the other device if that bothers you. Apparently the wall socket is not built for serving two power intensive devices at the same time. – user 99572 is fine Oct 13 '15 at 11:36

The available power on a single USB 2 port is limited to 500mA. If you power several devices and they together use more than 500mA, you are working outside of the USB specification. You have to use a power adapter for the hub.

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