[ubuntu] Raid signatures

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http://ubuntuforums.org – I am running 12.04 server edition.I have 2 x SSD disks which i set up during installation to run my operating System on Raid 1.I now want to add 3 x iTB disks for storage operating on Raid 5.I added them to the server and tried to use mdadm to set up the array.For some reason the array did not work properly and so i tried to start the procedure again by deleting the partition on each TB disk. Unfortunately i am now in the position that the server will not boot with the storage disks connected.If i disconnect them it will boot fine but when they are connected ,the system gets to the Grub screen (Hardware)