I8190 broken screen - only flashlight working - Galaxy S III Mini Q&A, Help & Troubleshooting

Hi,
my girlfriends' phone has been damaged (something was falling of the screen)
Now when we try to turn it on, only the flashlight is blinking very very fast (like a strobe)
The PC does not recognize anything of the phone (nothing at device manager or adb)
Does anyone know how we can boot up the device, to get the file access?
Thanks.

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