BeagleBoard Black - No lights except power

Hey all,

I recently bought a OpenROV kit [1] that comes with a beaglebone black.
I follow the procedures on the OpenROV website, and our ROV worked for a while.

But, I don’t why, the beagleboard suddenly shut down and doesn’t work anymore.
When I connect it by USB, the power light is lighting up but none of the users light.

I tried the method describes in the elinux website [2], but when I hold the boot switch nothing happens.

Do you have any clues that could help me to have my beaglebone working again ?

Thanks for your help

Have a good day