Windows – Hp Proliant ML350 G6 Fan 1 Missing

The system boards on G3 ProLiant servers tended to fail in this manner: the fan sensors tended to go bad. Most of my G3 servers died near 5 or 6 years of service.

It's an 11 year-old system. If you absolutely want another, pay $50 for another one on eBay or replace the system board.

I have put in the same server: 1x 3TB WD Red, 2x 2TB Hitachi Deskstar 5K and 1x 1TB Hitachi Deskstar 7K. All 4 disks are detected by the BIOS and I was able to partition and mount them.

So it should work for you too. Because you mentioned that your 1TB HDD is working properly on another machine, I would try to update the BIOS of the Proliant to the latest version available. I would also try to put the working 250GB hdd in the other slots to see if they are not faulty. Finally, you could try to create a new partition table for your 1TB hdd on the machine for which it works, and to select msdos (not GPT) partitioning. Once done, plug back the hdd in the Proliant.

Note: check in your BIOS that you do not have RAID configured and that disks should be using SATA AHCI. I guess this is the case, because you already have 1 disk working, but better double check.