Hello,
You have different type of things to do...
If you want to have access to disk (to do a check disk), boot with the SME Server CD (press hold shift) or in the boot command type sme rescue (check the menu option or in the forum)...
Second, have you try to boot on only one disk at a time... Try the first one... Then if not working try the otherone... It possible one of them was defect !!!
Stéphane