Q: 4s updated to iOS 9 but does not work

Hi wjm332,

Thanks for using Apple Support Communities. Based on what you stated, it sounds like the screen on the iPhone is black. I would recommend that you read this article, it may be able to help the issue.

Get help with the screen on your iPhone, iPad, or iPod touch - Apple Support

If you see a solid color screen (black, white, or blue)

1. Plug in your device to a power source. If you see the low-battery screen when you plug in, let your device charge for at least 10 minutes (20 minutes for iPad) before using it.
2. Force restart your device while it's plugged in.
3. If this doesn't work, restore your device.
4. If you still see the issue after you restore, contact Apple Support.

Cheers