Start up Led's are not blinking

I have got BBB and want to work but as shown in the support and manual, As I provide the USB LED’s D0,D1,D2 are glowing continuously but no blinking is going on, and I can’t connect even through browser.
Could any one help me.

It sounds like the boot loader isn't loading the Linux kernel. You can
review what's happening with a serial cable if you have one.

Otherwise, you can boot off a uSD card and poke around to try and fix
things (your eMMC flash is probably corrupt, perhaps due to unclean
shutdown?), or just re-flash the eMMC.