Help Can't hard reset

[The_Duke]

So our tablet sat on the shelf for a while and we forgot the to unlock it. NBD, just hard reset. Except....it doesn't work. I've tried the paperclip in the hard reset hole. I can feel button get pushed, but even after holding for about 10 to 15 seconds absolutely nothing happens. I've also tried the Volume down + Power and I get an initial buzz, but then holding until my fingers scream....and still nothing. Any thoughts?