Reboot and select proper boot media in selected boot device

Title says it all. I just installed a new ssd drive and loaded W10 on it. All was working fine; W10 rebooted several times did updates rebooted and all was OK. I got to work connecting other drives and put case back together and then the no boot. I disconnected the other drives; still not recognized. I've booted to a linux USB and ran gparted and it shows all the drives and partitions, but they don't show up in the BIOS and boot order. The are recognized on the SATA list. The computer is a home build of mine that I put together a year os so ago and normally I am without problems. I can't figure why the drive / drives don't show up on the boot order list.
There is another bootable drive that doesn't show either. It's a long story but I had to load W8 on another drive just to get a W10 install USB. I'd tried writing a W10 USB in linux but didn't work; I digress.

12/7/19: Duhh; Somehow AHCI had been switched off. All OK now.

Glad you got it sorted.

Please mark your thread solved. Will help others who may also experience this.