Hello Dawn,
If you could tell me the model number for the PC and let me know where you bought it, with that info I can better assist.
Optane memory is finicky, and it sounds like your bios setting were lost, maybe the Optane SSD died,
We need to determine if you have a spinning disk or another NVME SSD, you may only need to disable Optane memory or NVME in the computer BIOS to get you up and running again.
Optane memory is basically a fast cache disk, this was before NVME SSDs were big, so your data might still be safe.