I have the Kingston 8G micro w mini adapter and use in N810 w 5.2008.43-7 ever since I bought them, 3 cards, and never a problem. That being said, it is just 3 points on a QA curve.

1) Take out the microSD from the adapter and re-insert. Probably do no squat as you can boot partially.

2) re-do the SDcloneboot, use anything you feel comfortable, I use this, thread #6, and it takes only 2-3 min and it wont touch your FAT partition, i.e, it will clone your internal flash OS and everything into the SD existing Debian partition, presumably ext2 partition. If not sure, do this,

xterm
sudo gainroot
df
and post results 1st before attempt,

Edit: I assume you are booting from the 8G SD card. If not, then, 1st thing to try is to simply remove the card from the slot and reboot and see how that goes.

good luck,

bun