Normally this message is associated with a SMART error, which is an early warning of an impending drive failure. All 5 drives "could" have smart warnings, but I think there may be another problem.
I would recommend these things:
Remove, Inspect and Reseat each hard drive and cable on the Scsi Backplane and also the Scsi cables on the motherboard
Upgrade the System BIOS and ESM Firmware on the PowerEdge 2400. This will also upgrade the Scsi BIOS.
If there is no data on the drives, do a low-level format on each drive.
I have sent you some information via email on some tools which may help us resolve the issue.
The Utility Partition diagnostic results you posted are ambiguous and may not be trusted. Actually these diagnostics are an older version, installed when the server was first manufactured. There is no date code, so these errors could have happened anytime sine the server was new. A note about the reference to PS2. This usually indicates the second power supply was not plugged in. If you do not have 2 power supplies, it is just a false error message.
Try removing the drive that the Elite diagnostics reported bad. Then retest each drive by itself in the server.