The home button on my iPad wifi has become unresponsive, however I have been unable to find a part that would change the switch. I have read the repair guide but don't know which part I should buy to get a née home button switch.
This sounds like you could get it fixed for free if you contact Apple. I have seen a couple of iPads with unresponsive home buttons that Apple fixed for free even past the 1 year warranty. If you do not have any liquid spill try Apple first and let us know if you have success.
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