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Perhaps it is not booting (this can happen if some board is plugged on top). Have you tried powering it up without any cape plugged on?
It could also be a faulty or corrupted micro SD card, if you're booting off that. Or corrupted on-board Flash. To fix that, you may need a replacement microSD card and reinstall.
Also, it's highly recommended to connect to the serial pins (e.g. use a 3.3V UART-USB adaptor) to see how far in the boot process it has got.
To do that, see the section "Using a serial cable" here: Some quick-start things to do for developing on the BBB
1 of 1 people found this helpful
Did it work before, and now it stopped working? Or is this the first time you used it?
The user LEDs are the 4 above the mini-USB port. Does the "PWR" LED light up, the one right next to the 5 volt barrel connector?