My samsung tab a wont turn back on!! Helppp!!!!

[Melisakarlo1234567]

someone please answer its urgent and i don't know what to do!!!!!!
my samsung galaxy tab A shut down for no reason but when i tried to reboot it, it said "downloading do not turn off target" but me being me, i turned it off and now when i try to turn it back on the screen keeps flickering and shutting down

 

[afblangley]

Do a hardware factory reset.
https://support.t-mobile.com/docs/DOC-28306