Dracut : Could not boot

[bruno pinto]

Hello everyone,
I need some help in my problem.
Last friday, I receive a new laptop to install by FAI (Dell Precision 5570) , and when I boot by PXE with FAI, I have a message lie this:
"dracut: Warning: could not boot"
I search the solutions these two days but no results.
The problem I can't understand is that no computer has ever done this to me before.
If anyone could help me, I would be very grateful.
Kind regards 
Bruno Pinto

--------------------------------------- 
Bruno FERREIRA PINTO    
Service Informatique
IJCLab
IN2P3/CNRS
Universite Paris-Sud 11
Rue André Ampere Bt 100A Pce A118
91898 Orsay Cédex
---------------------------------------