My Mac Won´t Start Up / Il Mio Mac Non Si Avvia, Aiuto?

ieri é mancata la corrente elettrica a casa per circa 30 minuti mentre ero al pc, una volta tornata l´elettricitá il mac non parte piú. Questi sono i diag led sulla scheda madre.

yesterday there was no electricity at home for about 30 minutes while I was at the PC, once the electricity is back, the mac no longer starts. These are the diag leds on the motherboard.

EFI LED Off

PWR LED ON

GPU PRESENT LED ON

Trickle Orange LED ON

la mia configurazione é :

Mac Pro 2,1

8 Cores Xeon X5365

16GB Ram DDR2 FB-DIMM 667mhz

256GB SSD Samsung 850 EVO

Radeon HD5770 1GB Mac Edition

Mac OS El Capitan 10.11.6