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What are the implications of not doing so?
It won't boot.
Change MOBO - set BIOS to Boot from CD - boot with XP CD / vista DVD in the drive and do a repair install.
This should replace drivers from old board with drivers for new board. (have MOBO driver CD ready)
Another method for XP.
Drivers to disable BEFORE changing motherboard
One very common reason for boot issues on an XP system is problems with loading drivers and system services, which may be unstable, damaged, or corrupted. Use the Enable Boot Logging advanced startup option to try to determine the driver or system service name causing a failure, or even a filename referenced in any error messages you might receive when trying to boot XP normally. This information is useful, since the Recovery Console allows you to configure the startup settings with drivers and system services, selectively disabling them or changing their startup settings if necessary.
The listsvc command displays a list of all critical drivers and system services, and displays information about their current settings – for example if they are configured to start automatically, manually, or if they are disabled. The enable command allows you to enable a service or driver, and control its startup setting. For example, the command enable messenger SERVICE_AUTO_START would configure the Messenger service to start automatically. The disable command disables a service, just as the name suggests. Try disabling drivers or services which you suspect of causing boot problems, but be sure to write down their current settings first, just in case you need to change them back.
It boots and works perfectly, hence me being unsure of whether it was necessary or not. Old mobo was Asus P5ND2 SE, new one is Asus P5QL/EPU.
The reason I changed was a crappy Windows Experience index for the processor and RAM. The supplier of my PC advised a Bios update which failed part way through, and they later told me it was goosed.
I hope I do have an improved index after all this trouble.
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