New
#11
Asrock is a subsidiary of ASUS.(technically it's more complex than that as there is another company in the middle and they do keep the two companies separate, but in the end it's ASUS the owner)the mobo is ASROCK, not ASUS
ASUS boards and Asrock's do share some similarities and issues, as far as I remember.
This.
Another thing could be that you screwed up the front panel connections, so the machine was receiving a constant "reboot" order like you were keeping pressed the hard reboot button.