[arm-allstar] Won't boot from SD

[Robert A. Poff WB3AWJ]

When I try to boot the BBB from the SD card, all that I get is the four user LEDs coming on and staying on. (and the power LED of course) 
With a monitor on the HDMI output, nothing seen at all. 
Held down the BOOT button on power up. Doing that, NOTHING happens. Not even the user LEDs. 

The board boots fine from eMMC. 

I've tried re-writing the card, and re-downloading the image. 

At one point in my klutzing around I managed to damage the eMMC /boot partition. 
So I downloaded the Debian image, wrote it to the card. 
The board started fine, and flashed the new image to the eMMC. 

Wrote the Allstar image to the card (same one) once again. Same results. 

Same card, same power supply, same procedure........ 

With the BBB running under Debian, I can mount the SD card and read/write to it. 

This is an Element14 Rev C board, just bought from Adafruit. http://www.adafruit.com/products/1996 

Suggestions? 

Robert A. Poff 
Loganville, PA.