Prob booting sometimes (ML350G5 / smart array E200i

[Gee99]

The system disks are two mirrored 450Gb 3.5 in drives. It is booting up and checking C drive and not finding it then going to boot from network. Normally a cold boot and ensuring not USB drives are plugged in gets it going. Today it just would not boot. I pulled one of the drives out (in bay 2 which did seem to only show a status light sometimes so wondering if it had a issue) and it came up warning that a drive was down and I plugged it in and it booted. The server is very remote and need a solution. It is currently rebuilding the array . (Server runs windows 2008SP2)