Re: Reinstlal OS after changing Motherboard?
Most of the time you have to. It depends on how similiar the new mobo is to the old one. When there are two many hardware changes the HAL ( hardware abstraction layer ) in your os will get confused. On a PC, HAL can basically be considered to be the driver for the motherboard and allows instructions from higher level computer languages to communicate with lower level components, such as directly with hardware.
Basically, if you install a new mobo of the same model, most of the time you can get away with reinstalling some drivers. If it is of a different make you probably need to reinstall the OS. Sometimes though you get lucky.