unable to boot T2000 server + ERROR: boot-read fail

Hello,
I need help to fix this problem

My Sun Sparc T2000 looses the ssh connexion. Unable to ping. When i restart the server i get the following error

 

SC Alert: Host System has Reset
cpu cpu cpu cpu cpu cpu cpu cpu cpu cpu cpu cpu cpu cpu cpu cpu Device: pci
Device: pci
/pci@780: Device 0 pci
/pci@780/pci@0: Device 1 pci
/pci@780/pci@0/pci@1: Device 0 network network
/pci@780/pci@0: Device 2 pci
/pci@780/pci@0: Device 8 pci
/pci@780/pci@0/pci@8: Device 0 Nothing there
/pci@780/pci@0: Device 9 pci
/pci@780/pci@0/pci@9: Device 0 scsi tape disk

ERROR: boot-read fail

Boot device: net