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Poweredge r420 replaced sysboard- now cannot see both SAS drives


I have just replaced the system board in our Poweredge and when I try to boot the system cannot detect any of the 2 x 1T SAS drives.  It only detects the NIC cards and the DVD drive.  They were previously set as a RAID 1 I believe.

We have embedded RAID using the PERC S110.  When enter the PERC BIOS (CTRL-R), no physical drives are listed (just the DVD drive).  I'm pretty confident all the cables are connected properly; I'm not getting any errors on boot...

I've tried BIOS and UEFI boot both with no luck.

Any thoughts or things I can try?



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