I had SSD added to my laptop rig, next to an existing HDD with Windows 7. There is Windows 10 installed on SSD and it boots immediately when I power laptop on. I get no option to boot Windows 7, furthermore I can't see HDD in BIOS Boot Priority List.
It does show up elsewhere in BIOS and I can see all files on HDD from Windows 10. How do I get BIOS to recognize my HDD as bootable again?