I'm using Windows Server 2008 installed on a HP ProLiant Ml350 G6 server. It has six hard drive slots, previously only two slots were occupied with 500 GB each. Recently I filled up the remaning slots with 1TB each, but it didn't detect the hard drives.
So I tried a different method and swapped the hard drives. That didn't help. Then I inserted all the hard drives into their original slots where they were before and rebooted. I got an error about the "Bootmgr missing", and I should press
ctrl+alt+del to restart.
Is this a hardware problem or an operating system problem?