well, I just unscrewed the back again and rechecked the connections and they're fine. Also, when I power down to shut it off, it won't shut off completely, it comes back on immediately.
How would I do factory reset? The only thing I can do is press the Power button and that doesn't work like it should. Can you let me know how to factory reset please? Also, would that mean I lose all my stuff?
Thanks for the quick response
EDit: I pressed the power button down for a while, then when I let it go, it has a 'Android is starting...Optimizing app (and a countdown) of 122
it's done that twice after I've pressed down the power button for a good while, but the screen still remains unresponsive.