Very similar problem (the same, even...) - http://www.korgforums.com/forum/phpBB2/ ... ght=update
I insert 3 OS disks, everything is fine and then just a black screen - and if you look good, you can see error messages...
And no - I am not a fool, I've done everything in the right order, following manual description, all my disks are brand new and I tried it 3 times - still the same problem.
Then I installed version 1.0.2 (as it was in the beginning) - and everything worked... but all GEs are ruined now, because I also installed GE disks.
Before only combies were ruined, but actual GE parameters were okay - now, they just don't work, and Karma crushes if I try to use them.
So I don't think that this guy sold it just because it had this problem:
1: it has 1.0.2 update, not 1.0.6
2: GEs were okay.... and you can't download original GEs...
Any one had the same problem? I see someone did!
Lol... me and my bad luck... I guess it was too good to be true rofl...
and now endless paying/waiting/sending it to repair shops... This my second Korg keyboard, and Korg let's me down for the second time 
first - not properly working Radias, now Karma.Karma without Karma - even more useless than Karma without Karma MW....