Saberen :
Someone told me that if I replace my motherboard that the OS will not work is this true?
That is a 100%
maybe.
It might work, it might fail horribly.
It might work, but you get lingering issues later.
For a new motherboard, a clean reinstall is always
recommended, sometimes
required.
And then the OS licensing issues come into play.
What OS is it? Where did it come from?