I'm posting after reading similar topics on this Google group, none of the 
solutions worked. [also my problem is a bit different than the ones before, 
I have been struggling for about a month to get my BBB working!]

Here is the sequence of problems-failed solutions I have been through with 
my board :
1. About a month back I bought a BBB from a local retailer. Worked 
perfectly for first two days, I was able to ssh, install pyBBIO etc.
2. The next time I booted (tried to) my  board, it failed. Only power 
button was on, other LED's didn't even start blinking. I plugged out the 
power, tried 5 minutes later, it worked! ssh-ed again and shut it down 
(sudo shutdown 0)
3. Next time while booting, I had the same problems, removing powering and 
starting again did not help.
4. I downloaded Arch Linux on a microSD card, put it into the BBB powered 
the board holding the boot button, within half a minute I was able to SSH 
again! Arch worked.
5. I wasn't that happy with the Arch distribution, even though it worked. 
So I got an Ubuntu image on my microSD. Tried booting the Black the same 
way holding the boot button, but all that happened was all 4 LED's were on 
for ~15 minutes [ I still don't know why this happens! ] Then the led's 
started to blink, I was able to SSH. Sadly this happens every time I boot 
with Ubuntu (via microSD).
6. Later I thought I would re-flash Angstrom, and got the emmc-flasher 
image on my microSD. Booted the board with the boot button pressed. 
According to the manual the lights should have started flashing, and once 
the image is written all 4 LED's should turn on [
http://derekmolloy.ie/write-a-new-image-to-the-beaglebone-black/ ]. But for 
me all the 4 LED's were switched on from the power on stage, for ~5 min, 
later they started to blink, but after 10 min or so, all 4 LED's abruptly 
went off. (In the instructions it says that all 4 LED's will go on when 
writing is complete)
7. But anyway hoping that writing to the eMMC was complete, I booted the 
board normally. USR0 switches on first followed by USR1, USR2. Then it 
freezes here. I'm STUCK!!

What should I do now? 
also a couple more questions :
- What does holding down the boot button do if the img in the SD card in 
not a emmc-flasher? Does it just boot from the SD card or does it also get 
written to emmc?
- Is there some setting by which I can boot via the SD card without having 
to press the boot button every time and also not having to burn the image 
on the emmc?

regds,
Deepak

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