Going on and off

I turn on my book it comes on for 5 seconds and then cuts off and i have a lot of information that i need to get but it won’t stay on so I can retrieve it I unhooked it once from my laptop and now I have a problem kgetting it to stay on the lights just blinks of and the laptop doesn’t even recognize that it even there anymore …could someone please help me with this really worried!!!

Did you try with WD? If it doesn’t stay on then it could be the power adapter.