HD-HC250U2 Power light does not stay on

[pira97]

I have a buffalo HD-HC250U2, when I turn on, the green power light stay on for a couple of seconds and then turn it off. The computer can't recognize it. There are a switch in the back, when i turn it to manual, the power light stay on but the computer still can't see it.

Anyone have some idea? Or the device is dead?
Thank you in advance.

[davo]

This means its not getting enough power via USB, change the USB cable and if necessary test it on a different PC.