A bit of info that maybe will help the Asus engineers.
While a bricked C6H wont respond to the power button, the PSU can be "jumped " and the mobo will attempt to POST. the behaviour thus forth seems to be dependent on the BIOS loaded.
v. 0702 POST codes cycle and quickly halt on 61
v. 5704 POST codes cycle indefinitely
v. 5803 POST cycles a few times, display initializes, and displays the ROG splash, halts there along with POST code 99
Will continue to test and report if there is anything else
This because the BIOS update bug kills the embedded controller (EC) and one of its functions is to manage the power on sequence. You can still make the board POST by forcing a power on as you say, but there will be other issues since the microcontroller is not working properly in the first place.
a quanto pare il bios update bug della crosshair killa il controller integrato, una delle funzioni del controller è proprio quella del processo di accensione. anche forzando il post della scheda madre con i cavetti non risolve il problema perchè il controller non funziona correttamente. Non sarà possibile resuscitare la scheda madre tramite flashback o dvd.