Used sleep timer last night TV wouldn't turn on this morning
You didn't mention if you got it to eventually work. Did you try pulling the power cable, then turning back on? Even so, may need to see if you can repeat issue after another sleep timer.
No it's still not working I tried all of the online suggestions still won't turn on
That's too bad. You may have to reset it, if it gets video try setup again, but if not i would try to get warranty replace.