i recently installed a SSD (cruical BX100) and now the mainboard is acting weird.
after power on it takes ca. 15 seconds until the startup starts and displays the first message from the BIOS of the graphicscard (GTX 970).
in the first POST screen i get 0 detected USB devices and messages that boot from USB failed with a countdown of 5 seconds wich i can't skip because the keyboard isn't working (USB)
after the countdown ends the system boots and runs completly normal and as fast as you would expect from a SSD.
i went through every BIOS setting and boot from USB is completly disabled. the only time i bootet from USB was the OS install (Win 10). there is no USB device connected from wich the mainboard could try to boot.
i'm out of ideas.