Galaxy tab a screen flashes off and on itself and won t turn on when I turn it on?

galaxy tab a screen flashes off and on itself and won t turn on when I turn it on. It s powered up, but the screen itself won t turn on. It locks itself and then the screen won t turn back on. It ll flash on here and there. I ve reset it twice and tried safe mode and it s doing the same thing.
5 answers 5