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Problem with ALTAIR-IMSAI 8080 CPU Board

I just finished assembly of the S-100 8080 CPU board for my ALTAIR 8800. The board appears to run great except that I can't get the SD card to initialize! I have tried several different makes of cards from 256Mb to 1Gb but no luck. 

Any ideas from those who have built this board? Any feedback would be great.