The power cord and iTunes icon on the LCD means that the device is in DFU or Restore mode and needs to be connected using a cable to a computer with iTunes so that the device can be restored.
Once you connect it to the computer with iTunes open, you'll see a prompt that iTunes has detected a device in recovery mode. .... follow the prompts.
Press & Hold Home button and Power button simultaneously until you see the Apple logo. That should allow you to boot back into iOS.
If that doesn't work,
Press & Hold Home button and Power button until the screen goes black
Press & Hold Home button ONLY as you plug in the USB cable to the computer.
Keep holding the Home button until iTunes recognizes your device, and then you should be able to restore.
Let me know how you get on, and please get back to me if you have any other questions or concerns and I will try help you more.
It may take more than one exchange to get a fix, so please work with me, you are my eyes and ears here
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