How do I get my iPhone off of the Apple logo?

My iPhone 5s is stuck on the Apple logo and won't boot up. I think this is called a "boot loop," but all the information I've found is related to jailbroken phones. Mine's not jailbroken so I don't know what caused this. How do I fix this without losing my data?

Ddasd

A boot loop actually is if it looks like it is loading as normal but then restarts vs what you are seeing where it just stays on the Apple logo.

Try a soft reset
1. Just press and hold both the Sleep/Wake and Home buttons simultaneously for at least 10 seconds, until you see the Apple logo. You can let go of both buttons after the Apple logo appears.
2. Your phone will go through the usual process of starting up.
3. You'll be back in your home screen.

Should also plug into a computer with iTunes running & see what message (if any) comes up.