Beaglebone Blue Bricked

I have a Green (from Seeed) - so not the same one as you. Have you tried pushing the User button with the working SD Card inserted, and then providing power?

Yeah, the Blue has an "SD" button but nothing changes if I power the board while pressing any of the buttons on the board including the SD button.  I appears to be dead.

Maybe jkridner knows how to revive a bricked Blue?

That's disappointing if the design doesn't have UART console pins : (

I don't have a BB-Blue, but was wondering, does it make any difference if a battery is also connected, as well as the 12V supply? With the original BBB design, if it was modified for battery operation, then the battery needed to be present even if it wasn't charged. Probably the BB-Blue design is different but it could be worth a try. 

There are a couple of UARTs mapped to JST connections on the Blue.  I'll have to see if I rig a FTDI to JSt connection to one of these to see if there is any console output.

As far as power, I've tried with and without the battery connected while the 12v supply was connected.  I also, tried running with just the battery as well as with just the USB connected.  Each has the same result with the Blue not booting. 

if you happen to have a Bus Pirate, it allows to act as a USB / UART passtrough (attention: 3.3 V signals on the TX/RX pins, not RS232 compatible.

If I recall well, you can also turn an MSP432 LaunchPad in a USB to Uart converter by tapping off the pins between debugger and controller section.

I got it working with an MSP432, Jon

I'll write down the instructions. It's easy.

A Bus Pirate would be cool, but I have a few FTDI to USB cables so they should suffice with regards to connecting to  a UART on the Blue.  I am just not sure if the console on the Blue is being sent to a UART or not.  I'll have to try and see.

Yeah!

Locate the debug header. I used this website as inspiration.

Ultimate Serial Port

You need:

MSP432 LaunchPad , red or black) and BB

2 USB cables, one for each. Don't plug in yet.

3 female to female jumpers (I only have male to female and used a breadboard as interconnect.

On your MSP432, remove the RXD and TXD jumpers in the middle. Don't worry about the other 4, they can be mounted or removed.

Connect TX to TX, RX to RX. (yes, I thought I needed to swap but it is what it is - edit:because the PCB of the launchpad labels the microcontroller side signals). See schematic. Tap the signals from the debugger side of the LaunchPad

Then connect the MSP432 USB. Check in the Device monitor what port number is assigned to the UART.

Open Putty, create a serial connection.

Here are the settings (use your com port)

Connect.

Nothing shows. That's normal

Now plug in your BeagleBoard. Your putty session is an active UART session into the debug port.

Good luck.