ML115 Nvidia raid won't boot

[Netorange]

Hi all, i've got this problem this morning, the server won't boot.

error appears when looking for nvidia raid:

MediaShield ROM BIOS 9.85

Detecting arrays...

0  Error   NVIDIA   RAID5   465.77G

1  Error   NVIDIA   RAID5   465.77G

I've got 3 disks 250gb sata, raid 5 

all disks are correctly recognized entering the bios, but if i enter mediashield i've got

boot  status   vendor   array   Size

N/A   Error     NVIDIA   RAID5   465.75G

N/A   Error     NVIDIA   RAID5   465.75G

and entering detail i've only 1 disk for every line:

first line

port   Index    Disk model       capacity

0.0    1           GB0250C8045    232.88g

second line

port   Index    Disk model       capacity

1.0    2           STM3250318AS    232.88g

what can I do?? please help me

thanks

p.