I took the hard drive out of a Dell Inspiron 660, attached it to a 32 bit Windows XP box and used Macrium Reflect to clone the drive to a new hard drive. Now neither of those drives work in the Dell!: No boot device available Sata 0: Installed Sata 1: Installed Strike the F1 key to retry boot F2 to run the Setup utility I know the Dell had Windows 7 which someone did the free Windows 10 update to. If I disable the UEFI boot option in BIOS, it will boot only to Windows 7. At first I wondered if I'd blown a GPT drive up by installing in an MBR box, but if it was a GPT drive I don't think the partitions would even have shown up in Macrium, right? Any advice on how to proceed?