Question No boot device available after installation

[Enocc]

I’m not a huge tech person but I’m going to try my best. I recently bought this new ssd for my laptop, but after getting a newer one I used it for my old PC. I’ve been having problem actually installation windows 10 into it as my PC only has BIOS legacy mode, so I used the command prompt to change it into mbr instead of gpt. My problems arose when the windows 10 installation media was looping, making me download over and over again, so I decided to remove the usb, and after so it said “no boot device available”. What did I do wrong?

 

[rgd1101]

old desktop spec?

 

[Enocc]

WD Blue 500gb ssd
4gb memory ddr2
Intel core 2 duo 2.33 ghz
System optiplex 755
BIOS version A22 (6/11/12)

 

[Enocc]

I was able to fix it! Turns out changing the SATA operation to legacy wasn’t the answer but rather keeping it AHCI. Can I ask why though?

 

[howtobeironic]

As I know it, unless you do a process (bring to safe mode, tweak registry, restart) if you change the SATA mode, Windows won't boot. Might be why.