I have a problem with my iPhone 4?

Well, I was using my phone and there was no problem. I left it for a while (10 minutes or so) to go do something. When I come back I try to turn on my phone and it doesn't. I assumed the battery was dead so I plugged in the charger. I noticed that when I plugged in the charger. My computer detected the phone but when I hold the power button it doesn't show the charging icon or anything. Could my screen be broken? Also, I noticed that my computer detects my phone as an unknown device.

So the problem is:
My iPhone 4 won't turn on for some reason even though my computer detects it as an unknown device.

Exact thing happened to my phone all it means is you have to go get your battery replaced

I think nothing wrong with your advanced phone but the settings! Also you may contact the apple store for more help.

I think my phone is on and has power but nothing is showing up on the screen.

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