Iphone screen turned black all of a sudden?

I was on my iphone a few minutes eariler and it suddenly turned off. The battery was at 40%. I tried to put the iphone in dfu mode ( lock + home button for 10 secs) but its still didn't turn on. Not even the apple logo showed up. I tried connecting it to my computer but it says unrecognized device.

Maybe its a hardware problem, but first try to restore it via itunes.

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