my iPhone 5S is not responding. Screen has gone blank, only apple logo on white screen is visible.

Hello sonapalu,

After reviewing your post, I have located an article that can help with devices that won't respond. It contains a number of troubleshooting steps and helpful advice for the issue you are experiencing:

iOS: Not responding or does not turn on - Apple Support

Your iPhone, iPad, or iPod touch may occasionally stop responding to buttons, switches, or touchscreen input and may exhibit one or more of these symptoms:

• Does not return to the Home screen after you press the Home button
• Does not wake from sleep after you press the Sleep/Wake button
• Does not turn on (or power on) when you press any button
• Does not start up past Apple logo
• Appears frozen or unresponsive
• Is unable to "Slide to Unlock" or "Slide to Power Off"

To troubleshoot these symptoms:

1. If a single application is not responding or stops responding when it opens, you can force it to close.
2. If the device is unresponsive or if certain controls aren't working as expected, restart your device.
3. If the device remains unresponsive or does not turn on (or power on), reset your device.
4. If there is no video or if the screen remains black, verify that the device has enough charge to turn on:
   1. If you are using an iPad, ensure that it's connected to the USB Power Adapter supplied with the device.
   2. Let it charge for at least twenty minutes, then see if it starts normally.
   3. If there is no image on the screen, press the Sleep/Wake button to attempt to wake the device.
   4. If the screen displays a red battery icon, continue charging the device until the battery is fully charged. Learn more about charging iPhone and iPod touch, or iPad.
5. If the above steps do not resolve the issue, or the if the screen remains black or shows a persistent Apple logo, try restoring with iTunes:
   1. Connect the device to your computer and open iTunes.
   2. If the device appears in iTunes, select and click Restore on the Summary pane. Learn more about restoring iOS software.
   3. If the device doesn't appear in iTunes, try to force the device into recovery mode, and then restore it.
6. If the above steps do not resolve the issue, contact Apple.

Thank you for contributing to Apple Support Communities.

Take care,

BobbyD

Try this; To force restart your device, press and hold both the Sleep/Wake and Home button for at least 10 seconds, until you see the Apple logo.