I got my tv stick for Xmas just gone.
For the past 3 weeks I cannot get it to work. I've tried unplugging everything and replugginv but nothing. There's no light on stick at all.
If there is no white light showing on the stick then it sounds to me like that it either isn't getting no power or an inherent fault on the stick.
Have you tried the stick with both the supplied power adapter and using a 5v dc 1 Amp USB port on your TV ?
Also maybe try a different USB to micro USB cable with the stick if you have one somewhere lying around the house.
You could try holding in the reset button on the stick for about 15 seconds to factory reset it, but i doubt it will work if the white light is not displaying on the stick.
If no joy, return it back to the retailer you bought it from for a replacement or refund.