Are both the power connectors hooked up, I always start with the basics.
From the manual, page 6 (page 5 picture)
Label 4. ATX_POWER Standard 24-pin ATX power connector
Label 25. ATX12V 8-pin +12V power connector
Confirm the front panel switch is connected and correct.
Label10. F_PANEL Front panel switch/LED header
If different connection from previous MB you might have to use an OHM meter to find the NO (normally open) set of contact on the power switch and test for closure on the pin out while depressed.
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