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- Newly reinstalled Windows won't boot

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04-14-2023 09:13 AM
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?