Hey all this has me baffled! I have a Samsung 250GB SSD as the main C: drive and a 1TB hard drive for files etc, also running Windows 10. Over the past 2 weeks I have powered my PC on say 20 times, within the 20 times, 2 of those have come up, latest was today. saying (when the PC first starts and states: 'loading operating system') cant find the boot drive record, please press ctr/alt/del to restart. I had tried restarting a few times, same error. I then booted into bios and noticed that the SSD C: drive was placed as a second boot? I change it back to be the first boot priority and windows loads up after it checks the 1TB drive for errors and I have no problems. What may cause this change to happen in bios? thanks all.