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STM32F4 Discovery ST-Link and Overcurrent (LD8) error

Question asked by JJ on Dec 10, 2015
I'm doing ADC and DAC on STM32F4 Discovery kit and suddenly, "USB Device Not Recognized" error pops up. Overcurrent LED (LD8) lights up and ST link error occurs. When I remove the Idd Jumper (JP1), PWR LED (LD2) shows a bright red but the COM LED (LD1) shows a very dim red light (solid, not blinking) and LD8 lights are off.
Is there anything I can do to make it work again? I appreciate your help and thank you for your time. 

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