Asus WRX90 & Threadripper Pro 7975wx build not turning on. Anyone else experienced this?

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:

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yup. thanks - already tried switches to default.
It shouldn’t make a difference, I just don’t want that extra screem in Windows Display prferences as it messes with layout and Logitech Flow
realised that I think it boots into bios but doesn’t display it.
So if I hit escape and return a few times it boots.
I turned off the Wait for F1 in Bios and it usually boots now.

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