Hi All My SJ7 star only turns on when plugged in / charging. When not plugged in and I press the power button, a couple of blue lights / LEDs at the top left of the rear screen lights up and then turns off and nothing happens. At first I thought the battery or charging was the culprit, but I bought some spare batteries and charger of aliexpress, and the same thing happens when using new freshly charged batteries. Any ideas? A quick search of the forum doesn't seem to turn up anything. Thanks!