clare.briars :
My gaming pc keeps crashing since I installed new mother board
Welcome to Tom's!
Is the new motherboard the same make and model as the old one? If not, you may need to re-install Windows, as well as the motherboard drivers and any other drivers(like for your GPU).
What are your COMPLETE system specs? Is it a pre-built(like Dell, HP, ETC.) or a custom built unit?