DL360 G5 Server unable to boot-up

Hey All,

I have an HP ProLiant DL360 G5 Server with SATA 120GB Hard Drive installed on it
Unfortunelty, one of HD is shown "Amber Light", currently system is down and unable to boot-up, an error message appear during booting process.

I beleive it due to fault in HD, could any one guide me how i can troubleshoot the issue to be sure.