I dont know about this device particularly but on many Samsung devices these buttons are a separate piece or attached to a charge port, I would check to see if the cable that connects them is torn, it may need replacing!
Did you try to do a hard reset on it? A hard reset is using a button combination to initiate a factory reset on the device. I would Google your tablet and look for the hard reset combination, on Samsung devices it is generally volume up, power and the home button and than release the power button when the Samsung logo appears. If that doesn't work I would bring the tablet to a Samsung tech. They are able to reload software on Samsung devices. I know some Best Buys have them, I am not sure where else they are. Hope this helps!
Changing the screen on a Iphone 5C is not too difficult. Guides and parts are available on this website to complete the repair. You could always check out the guide, and if it looks too difficult you can bring it to a repair shop. Apple will repair the screen as well, I would shop around and find the best price and situation for you!