Only thing not mentioned above, but you've probably tried it: Completely power cycle it (i.e., unplug from wall for ~30 seconds before plugging in again). But if you've done that, and the OSD still won't come up, then I'd say RMA time.
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Z690-E, i9-12900k, 2x16 DDR5, 980pro nvme x3, Ryujin-II 360, Strix Animate-II, Evga 3090 ftw3