Strange noise

Machine: k40_

Board: cohesion 3d

Firmware: Smoothie or GRBL-LPC? “I have a new board and I’m using whatever it came with” is also a great answer!

Problem/ Question: _Hi
I recently replaced my nano 2 for a cohesion 3d board but when I turn the machine off there is a hissing noise coming from the steppers and I can’t move them, it’s like they are locked, this noise only stops when I turn off the power to the board…
Is this normal or have I wired the board wrong. I’m new to this and I haven’t even test fired to align the mirrors. The machine moves as it should when it’s all turned on.
I have done a little video but it’s hard to hear the hissing, you can hear it of you hold it close though.
Tia
Paul.

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