do you remember if you originally install your windows 8.1 using UEFI mode??
If yes, please check if you could still find the UEFI boot manager?? if not, then you might need to reinstall.
normally when changing to new chipset, it will be better to ...
If yes, please check if you could still find the UEFI boot manager?? if not, then you might need to reinstall.
normally when changing to new chipset, it will be better to ...