From What I have seen in the past, the button to get into the BIOS settings is either the 'Delete' button or the 'F2' button.
Try these as soon as the computer comes on.
Is the sytem ready made or have you built it your self?
Looping like that does not sound healthy and does not sound like it can be controlled from the BIOS settings
Come back if you cannot get into your BIOS.
Keep it cool!