System won't recognize a RAID after upgrading to 10.5

Hello,
Two RAIDs were working great on an Apple G5 with OS X 10.4.0. After upgrading the operating system to 10.5 and other changes listed below, the computer doesn't recognize one of the RAIDs. The computer does recognize one RAID, which does not have a port multiplier; it does not recognize drives in the RAID with the port multiplier.
System: Apple G5 Quad Processor
SATA card: Sonnet E4P
RAID A: SC-SAT05PM, with Port Multiplier & single SATA cable
RAID B: Mercury, 2 drives & 2 SATA cables.
All 3 SATA cables connect to ports on the Sonnet E4P.
Both RAID's were created with OS 10.4 disk utility software
Here's how things happened, in order of time:
There are 2 internal drives in the computer, G5..1 & G5..2. My wife installed OS 10.5 to boot from internal drive #2, G5..2. Both RAID’s were recognized by the computer in OS 10.4 and OS 10.5. However, the system was instable and crashing frequently with 10.5. She then dragged the G5..2 10.5 Applications folder to the trash and she only boots to 10.4.
At this point, 10.4 is still recognizing both RAIDs.
We went on vacation and I shut down both the RAID and the G5.
After booting everything back up, the system will not recognize the RAID with the Port Multiplier. The computer Does recognize the other RAID with 2 hard drives.
Any way to get our RAID back without losing the data? I read another thread where somebody suspected firmware in the controller. The drives seem to initialize in the RAID box just fine, and the disk utility sees the individual drives, but reports them as Offline.
Mercury RAID with 2 Seagate drives and 2 SATA cables going to the G5/Sonnet.
Clicking on G5RAID..800 in the left column shows these results
Port Multiplier RAID with 5 Seagate drives: 4 are in the RAID set, 1 is not.
Clicking on disk10, which is grayed out, in the left column gives these results
THANKS!

The Port Multiplier in the failing RAID system has the Sil 3726 chipset, it’s the card on the left within this page: http://www.addonics.com/products/hostcontroller/pmcc.asp

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