Assuming your motherboard is the ASUS Pro WS WRX90E-SAGE SE, AA
is what you want to see typically. The AA
Q-Code means that your system is about to enter ACPI mode, meaning UEFI/BIOS is handing control over to the OS (very simplified explanation).
But if you don’t see anything, I would consult the motherboard manual and check that all the on-board switches are set to their default positions. Just check that everything works first before you start flipping switches.
Edit: From the manual: