I saw a few people have problems with getting black screens after installing A9LH. And it just happened to me too. I thought maybe we could get a repository of info to try and work out why and how to fix it that works for every situation. So post your console's starting firmware, previous hacks if any, and what you tried that worked to fix it (or what didn't work). Mine was an O3DS on 5.1.0-11. Never previously touched in terms of hacks. After restoring NANDmin.bin, the Luma config screen would just freeze after selecting things and pressing Start, and then afterwards just black screens on boot. I tried a number of things without success, including 5.2 Luma (which went black instead of freezing after pressing Start) and 9.2 CTR transfer, and it did eventually boot up but I am not sure exactly which thing I did caused it to work.