RAID 1 failure of both drives

Hi
My HP m9520f was configured with 3x1TB drives, two in a RAID1 mirror and one as a spare. This had been running fine and was the boot volume for Windows Vista.
Today, the computer would not boot from power-on, and the Intel Matrix Storage Manager ROM (ctrl-I) indicated "Error Occurred(0)" for both of the RAID1 drives. It asked me if I wanted to recover and use the spare, to which I answered YES. Unfortunately, it then goes on to say that the rebuild will occur in the operating system, which is will not boot.
The following is a picture of the configuration screen as it is today... Drive 4 is the spare which was promoted to "Member Disk(0)" but contains no data as the system will not boot.
Can anyone suggest how I can recover my RAID volume and boot the computer?
Alternatively, are there any further diagnostics to indicate why the RAID volume failed completely?

Hi,
Unplug the failing hard drive and reboot.  This has worked for me in the past when one hard drive of a RAID 1 volume set has failed.  You better hope that both hard drives have not failed (it happens).  The rebuild process should be transparent but it will take a while to complete.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
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