More facts please
You have to tell us more facts.
The minimum is exactly which Mint you have (Edition, version)
We also need to know a bit about all your hardware.
Run " lspci " in a terminal and post here (To copy from a terminal right click)
Some wifi and possibly built in sound can be connected to USB even if they are internal - if you suspect you have one of these run " lsusb " in a terminal.
Don't fix it if it ain't broken, don't break it if you can't fix it