I have a LSI 9300-16i HBA flashed in IT mode not working with Gigabyte GA-EX58-UD5 system board. When I attempt to boot the system board, the POST freezes and does not complete. The Gigabyte GA-EX58-UD5 system board was purchased in 2010, so it's 16 years old. When I use a Supermicro AOC-SASLP-MV8 rev 1.01 drive controller board, the system board boots up properly and boots into the UnRAID flash drive. If I boot up the system board without the LSI 9300-16i or Supermicro AOC-SASLP-MV8, the system board also boots successfully and boots into the UnRAID flash drive. The Supermicro AOC-SASLP-MV8 uses Marvell technology, which is not recommended for UnRAID. There's may be a compatibility problem between the Gigabyte GA-EX58-UD5 system board, and I might need to replace the system board with a new system board, CPU, cooler, and memory, refreshing the hardware.

Does anyone have recommendations to refresh a 16 year old system board, that's compatible with an LSI 9300-16i HBA flashed in IT mode?

If you haven't yet, it may be worth looking for a BIOS update and/or trying a different PCIe slot.

make sure the LSI HBA is in a full and tru x8 wired slot.

13 minutes ago, JorgeB said:

If you haven't yet, it may be worth looking for a BIOS update and/or trying a different PCIe slot.

https://www.gigabyte.com/Motherboard/GA-EX58-UD5-rev-10/support#Support-Bios
F13 is the last bios avalbe due to age. It is recomened to upgraded to the lattest motherboard system firmware...

you also have a old board that was at teh transtion phase form pci and pci express
Gigabyte GA-EX58-UD is pcie gen 2 if ther is a compabiltiy its a pcie generation of the lsi HBA.

The LSI SAS 9300-16i PCIe to 12Gb/s SAS HBA card is PCIe3 x8

I have not had any issues with testing over the years with Marvel chips and super micro boards...
Please make sure the motherbaord/system board has at least a pci gen 3 or higher and use that slot.

I believe your HBA is PCIE generation where the system board is too old to support the HBA cards you want...