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STM32F407 discovery HSE crystal is always oscillating

Question asked by az.E on Dec 23, 2014
Latest reply on Dec 24, 2014 by az.E

I've been using the STM32F4 discovery kit (the one that contains the STM32F407 MCU) and I've noticed something strange.
When I stopped the code at the SystemInit fuction and probed the HSE I saw that it was already oscillating although it hasn't been activated by software yet (I tried all the code lines before the SetSysClock function and I tried manually disabling the HSE).
Could someone explain this behavior?

Thanks in advance