My cloned PCs won't boot into WOL

[Bristow 0]

Hi !

I cloned some Linux Mint Una PCs with FOG and everything went fine.
Now I’d like to use the wake on lan feature to turn them on remotely and do updates on them.

The problem is that while the PCs start up fine when I switch them on normally, when I switch them on via WOL, they launch the FOG menu and after 3s switch to Boot From Hard Disk. From then on, the PC displays a cursor on an all-black screen. So the PC can’t boot normally.

Do you have any ideas for solving this problem?

Thanks for your help!