what might happened to my BBB?

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1

When I tried my HDMI cable, plugged it in. and also with a 5V2A power supply, it works.
But when I plugged in a apple keyboard through the USB host, the power just turned off.
And now it just gives a response of a blink of power led when I plug in the power.
What can I do? only RMA?

2

I would suggest an RMA to see what happened.

http://www.elinux.org/Beagleboard:BeagleBoneBlack

Gerald