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HP Recommended
HP Compaq 8200 Elite Convertible Minitower PC (ENERGY STAR)
Microsoft Windows 10 (64-bit)

I have an HP 8200 abut 4 years old set up with 2 disks in a RAID1 configuration as the system disk.  I decided to upgrade to SSD.  I replaced both disks with identical SSDs of about the same size as the original disks and reinstalled Windows from scratch.

The installation went fine, but the computer will not boot.  I get "Non-system disk or disk error"

Reverting to the original disks, which were erased along the way by the RAID controller, and reinstalling windows on them, the same thing happens - no boot.

I can boot the machine using an external WinPE on a stick, and I can see in Disk Manager the system disk is present and in Explorer there is a full Windows installation present, but I can't find a way to make the system disk bootable.

It appears the RAID controller, as well as erasing the disk content, also changes the boot record, making the disk non-bootable.

After 2 days trying things, I have run out of ideas.  Can anyone help?

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