"Why won't my Samsung Galaxy Tab 2 7.0 turn on?"に関する回答For anyone still having trouble with this, you can read herefor more information and a video tutorial.
"How do I turn off the front panel LED light?"に関する回答There is no official way to do this. You'd have to unplug the power source. You can use your TV as a remote but that requires setting up and a SmartSwitch. The Roku 4, to date, is the only device with some sort of way to power it off. You can read more about it https://www.orduh.com/turn-off-roku/,