Why you shouldn’t keep your computer on the floor
In this video you will find some good reasons as to not keep your computer case on the floor as well as some solutions.
https://www.youtube.com/watch?v=-6VGXLW6hWM
How to tell if your computer is in Legacy mode or UEFI mode
https://www.youtube.com/watch?v=_UuJrhqLdxk