In "Equipment" when you try to equip a Motherboard and there is already one, doesn't say that you are not allowed or something and the 'Unequip'
button appear.
But doesn't equip the new Motherboard, the old one still in the stats and when you try to unequip the old one, all your CPU/RAM/HDDs are gone, now
you must equip your new motherboard with all the other stuffs.
I guess some code can be writing when you try to add some equip, to check first if you want to add a better and equip them.
I hope you guys understand what I'm trying to say