My BBB doesnt boot in a pc without a micro sd card(with the angstrom image)

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1

if i connect my BBblack without the Sd card , my pc only recognize him as AM335X usb , but if i do with the SD card it boots without problems .

2

Sounds like you may have trashed the eMMC information. You might try reflashing the eMMC.

http://circuitco.com/support/BeagleBoneBlack

Gerald