I wonder the same. There's no way you'd get that screen if you're trying to get to download mode. Have you attempted through kies?
::Phone:: Sprint Samsung Galaxy S4 (White)
::Recovery:: TeamWin Recovery Project 2.7.0
::Firmware:: Rooted MJA kitkat 4.4.2
::Kernel:: 3.4 Cyanomod Kernel
::ROM:: AOSP - SlimKitKat
::MicroSD Card:: 64GB SanDisk (Fat32 Formatted)