HP Proliant problem, proxmox 3.0

Hi,

I have 2 HP DL380 G7.
I proceed to install proxmox on both machines with latest version.
On the first one it's seems all working fine, on second one I had a problem: whenever I restart the server an error booting (illegal OpCode) happened...
Now I try to reinstall proxmox.

Meantime digging about this problem I see maybe could be a Grub-related problem.
Someone out there have same kind of problem?

Thanks...