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STM32F4Discovery not working without external power?

Question asked by Eray on Nov 23, 2012
Latest reply on Nov 23, 2012 by Clive One

my stm32f4discovery board started not working without connecting external 0-5V power supply to GND and 5V pins.

when i plug usb only, nothing happens, none of the leds light. if i connect external power additionally, it connects to pc and i can even programme mcu.

all of this happened after shorting two pins unintentionally while making connections.

how can i solve this problem?