You didn't give the full device info but try this
If your tablet fails to respond when buttons are pressed or when the screen is tapped, you may have to perform a hardware reset on the tablet to restore functionality. To do this, simply use a small, thin object, such as a paperclip, to press the recessed reset button located on the side of the tablet. In the event that the Android operating system starts to slow down, becomes corrupted or otherwise unusable, you can reset the software back to factory default configurations and have a fresh start. To do this, use the following method: Note: This process will erase all of your personal information, all stored contacts and any programs you have installed on your tablet. From the Apps menu, tap on Settings, and then tap Privacy. Tap on Factory Data Reset, and then tap Reset Tablet. Tap Erase Everything to format your tablet back to factory default configuration.
