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No boot device available
My girlfriend's desktop computer has broken down and gives me the message "No boot device available". Before that screen it shows me something about RAID volumes which I don't fully understand. It's a Dell Dimension something, at least 5 years old. I tried resetting defaults in BIOS because I read somewhere that CMOS battery runs out of juice it could cause this sudden behavior.
I opened the chassi and there are 2 HDD's. When I go into BIOS it says that the drive located at SATA-2 is not detected. Could it have something to do with the 2 drives running in RAID that when one drive goes "offline" the other is dependent on the not-functional drive?
And one Windows-related question. This PC had Windows 7 installed on it when bought. My girlfriend upgraded to Windows 10 for free. If I would need to do a clean install of Windows 10 on the non-botched drive, how would I go about that? I may have some image from MSDNAA, but can I use her old Windows 7 key, knowing she did upgrade in the free year?
Thank you.
Regards,
Viktor