Try booting into download/bootloader mode or whatever it is called (sorry, I have had so many brands of android. They all call it something different.) And try flashing a clockworkmod based recovery. Then you can use the buttons to navigate the the storage / access ADB through recovery.
Sent from my LG-LS970 using XDA Free mobile app
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Devices: Evo Shift 4G (Dead) - Evo 4g (OG) - Sprint LG Optimus S - Sprint Galaxy S3 - Sprint Optimus G (LGOG) - Google Nexus 7 (2013)
ROM: All running Stock or some form of Cyanogenmod. (CM7, 10, or 11). Except the Galaxy S3, it has some Wicked Sensations.
Current Devices: Sprint Optimus G, Google Nexus 7