My iphone 4s has a black screen, and isn't responding?

I tried holding the power button because I figured it needed to be charged (had like 3 percent) but it didn't respond. Any ideas on what's wrong?

Hi
maybe is in dfu mode (connect with usb cable to your computer
or just leave it plug in to charge

press and hold the power button and continue holding for 3 seconds. On second 3, continuing to hold the power button, press and hold the home button for 8 seconds. Your iPhone should turn back on.\

or this:

Press and Hold the Sleep/Wake Button and the Home Button at the Same Time…
Wait for the Apple logo to Appear and then Disappear…
Usually takes about 15 - 20 Seconds… ( But can take Longer… )
Release the Buttons…

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