I purchased a refurbished optiplex 7070. It worked fine. I wanted to add another HDD to it apart from the SSD it came with. I opened the cover and added the HDD. Now when I try to boot, I get error that no boot device found. When I go to BIOS, under the drives, I see that both the HDD (SATA-0) and the SDD (M.2 PCIe SSD-0) are listed accurately. When I go to boot sequence and switch to legacy external drives, I only see options "Diskette Drive", "USB storage device" and "Onboard NIC". I do not see the SSD mentioned. So how do I boot from the SSD? Please help.