To add, the first 2 green leds light show up, with a blue led flash.
After that, only the power LED is on.. and there is nothing on the screen.
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Thanks for reaching out!
Could you please let us know the steps you took in order to enable this option? Also, is there any reason why you wanted the board to boot every 500ms?
Right now, let's try to reflash your board's BIOS and OS to see if that helps. Try to follow the steps in the following guides:
Let us know if you have issues flashing the BIOS and the OS.
I hope this information helps you,