Tablet screen flashes on and off but never starts up?

Hi all,

So I have been unable to actually start up my tab for about a week now. When it's plugged into the wall, the charging screen flashes on and off continuously. When it's unplugged, it will flash the "Samsung Galaxy Tab 2 7.0" screen on and off until the battery is dead.

Holding the...

Tablet screen flashes on and off but never starts up?