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Found another discussion mentioning code 99 on an Aorus Master X570. "Qcode 99 refers to Super IO Initialization," meaning any interface-connected board isn't initializing properly. If you just installed the system, it suggests a connection issue or insufficient power to a device, leading to an IO error. It's unusual they identified a faulty CPU with a bad connection, though it could still be questionable.
Understood. However, launching with the 5600X adds another layer of oddness. Wouldn't both encounter identical problems?
I'll attempt it this evening after work. I've turned off everything except one GPU, the boot drive, and the front panel. I'll also test without using the front panel connection next.
It should be that way. However, this seems to be an unusual problem. It might be part of the oddities as well. One potential reason is that the BIOS handles different CPUs with varying code (which is typical), but only the 5900X version has a defect. Usually, I suggest checking each component individually on another machine, though it may not yield much more than what you've already attempted. As they say, if something strange happens without a clear reason, the motherboard or power supply unit is likely the culprit. The motherboard appears to be in good condition, but you haven't tried using a different PSU. You don’t need a 1600W one—just a 750W should suffice for a basic test. It shouldn’t be the PSU, but testing it would be wise at this stage. Good luck!
I hadn't realized Gigabyte's Q-flash plus functioned differently from standard Q-flash through the BIOS menu. Appreciate the details!