My BBB (A5A) was working fine with ARM Arch (installed on the eMMC), but since yesterday it won’t turn on. I don’t know what changed.
When I plug the power source or the USB cable the PWR Led quickly blinks, but the board doesn’t turn on.
If I press the POWER button, the PWR led does a single blink too, but it doesn’t proceed to boot.
I also tried to boot from the SD card, but It didn’t work.
There should be a short on board. The U2 shuts itself down to prevent the high current draw which is caused by the short. That is why the LED goes off after it blinks once.
I Also have exactly same behavior with my Rev C BBB.
@Gerald: I tried RMA twice but i did not got any response !! I got the Board from Sumeet Online shop which is listed on beagleboard.org for Indian buyers. Any thoughts?