CD card does not boot after image copy

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       I did copy a working SD card using Win32Diskimager under Win7.
Problem: copy CD card does not boot.
Both cards are 8GB but not from the same company
Is there any trick?

or what ist the correct command  to copy by dd (Ubuntu)

dd if=/dev/sdb of=sdimage.img bs=512Mdd if=./sdimage.img  of=/dev/sdb  bs=512M

thanks a lot

I'm using this
dd bs=1M if=image.img of=/dev/sdb && sync

Does the green led blink? Are you using hdmi or analogic video?

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