I just upgraded my mobo from Asus p8h77-i to Asus Sabertooth z77. I started the computer noticing it didnt move from the Win8 boot screen, after a loong time i got into my account. But nothing worked properly so i rebooted, making my computer enter a repair mode. After a few tries and searches on the internett i found out that i had to install windows from scratch to make the UEFI work properly. I formatet my SSD but now i cant install Win8 on the disc because it says i have to use a GPT disc and my SSD is a MBR.
How can i make this work? Im really stuck and want to throw my mobo out of the window soon...
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Format the disc with the new installation. Did you try startup repair?