Power button is stuck inside and wont work.

My son's nabi 2 NV7A tablet power button is stuck inside the tablet and I can't get it out. I noticed there are 6 screws on the back of the tablet and I wasn't sure if took them out if I would be able to get to the power button to see if it is actually broken or what is going on. His tablet is an older model so I didn't know if I could fix it or if I had to upgrade and buy him a new one. Any/all advice on this would be appreciated.