StandAlone Booting

Hi,
I’m trying to boot in standalone mode.
Power supplied by usb.
BBB RevA5C

ID (boot-u) = latest image available.

When power on, i can see BeagleBone logo on my monitor for few seconds.
After… nothing happen and i have a black screen.

Any suggestions ?
Thanks

Why not just go here and see if that helps.

http://circuitco.com/support/index.php?title=BeagleBoneBlack_HDMI

Gerald