I have an older Dell 2600 Poweredge that has been rock solid for years- I thought one of the power supplies had failed, but it turned out to be a bad UPS that it was plugged into--

Long story short- the drives got shuffled (don't ask why, I don't want to go there) but now on boot, the drives flash green, then go dark and in the PERC 4 configuration utility it says that drives 0 and 2 are failed and 1 and 3 are online- I don't know the exact slots for the 4 drives, but they are all 36 GB SCSI 10K drives in RAID 5 -- How can I recover, if at all--