There are a few reasons why your tablet is not turning on including charger or battery malfunctions or the display may not be working. All of these issues are addressed and proper solutions are provided [[Samsung_Galaxy_Tab_3_7.0_3G_Troubleshooting#Section_Not_Turning_On|here]] on our troubleshooting page.
If the issue requires the battery to be replaced, here is a simple, easy to follow [guide|31880|guide] to lead you through the steps.