Safe Mode puts your phone in a diagnostic state (returned to default settings) so you can determine if a third-party app is causing your device to freeze, reset or run slow.
An alternate method is available if the device can be powered on and is responsive.
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With the device powered off, press and hold the Power button (located on the right edge) until the Samsung Galaxy S5 logo appears then release.
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With the Samsung Galaxy S5 logo on the screen, press and hold the Volume Down button (located on the left edge).
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Continue to hold the Volume Down button until Safe mode appears in the lower left of the screen then release.
This may take up to 45 seconds.
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With Safe Mode enabled, test device and app functionality.
Related Topic:
Using Safe Mode