My iphone 4 froze then shut down and now will not turn on.

i was opening an app when my phone froze, i held the power button till it turned off. it then took over 2 mins to switch off, it will now not turn on or charge. my laptop does not reconise that it is connected to it. any ideas?

Connect iPhone to Wall Charger and Reset, hold both Home and Power Buttons until the iPhone begins to start. Can take around 20 seconds of holding both buttons.

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