Not sure if anyone can help me out here, but I came into possession of an iPad Air for free and it is in pretty much perfect shape.
However, it refuses to turn on.
I charged it overnight and attempted to reboot and nothing. I connected it to my PC, iTunes detected it and I attempted to restore. However, it seems to hang at "Preparing iPad for restore..."
Does it show a "connect to itunes" screen at all? Which would be recovery mode. You might want to give DFU mode a try...
Leave it plugged in, hold the power and home buttons until it shuts off, after a few seconds let go of the power button (still holding the home button). Once it shows up in itunes try initiating a restore again.
It usually doesn't matter for something like this, but maybe try running itunes "as administrator". There has been some weird stuff caused because of Window's permissions being stupid.