How to reset an iPhone 4s that won't turn on due to a hardware issue?

I tried the hard reset thing where you hold the home button and the power button at the same time and it doesn't work. I think the LCD screen is bad.

My iPhone 4s gets warm when charging, and vibrates every 5 seconds or so when charging but it will not turn on. I just want to remove my icloud account, reset my settings to factory settings, and sell it. But when i plug it into the computer and open iturnes, it says "iTunes could not connect to my iPhone because this computer has not been trusted by the iPhone."

Please tell me there's a way around this without bringing the phone into apple.

You can go to YouTube and search DFU mode for iPhone 4S. You can do a quick factory reset and you should be good

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