Unable to boot-up from a concatenated RAID set

[Philip playfer]

No luck I'm afraid! I tried both the things that you suggested and upon startup I still got the 'grey international screen of start-up death' telling me that I have to restart the computer by holding down the emergency start-up key. Have you any other suggestions?

The only thing that was different to your instructions was that when I was in terminal it automatically asked for my password after I had entered the script and before I was able to press return. As a result I just typed my password as requested and then pressed return. You'll have to forgive me I know very little about working within terminal.

One other thing that is perhaps worth mentioning is that when I held the alt key, upon restarting the computer, in addition to my main hard disk the RAID came up as two separate discs one named RAID 1 and the other as RAID 2. Only RAID 1 was selected as the start-up disk. This may be normal, I don't know?