just bought the new reduced price black wii ending with the KL serial number
I'm having issues with it , it wont load channels when I have my usb flash drive plugged in or run any games when its plugged in either its brand new, I followed the soft mod guide to the latter
I have modded many wiis before and never had this sort of issue O.o
If i start the hbc with the usb flash stick plugged in it goes to a black screen, but the instant i unplug the drive the hbc will load properly and i can use it, its a 32 gig patriot XT memory stick formatted first to fat 32 then to wbfs just as i have previously done with my old 500 gitg external which died
I don't think how new it is or he serial number has anything to do with the issues you are having, I think on those wii's you only lost the available to read game cube games and game back ups from the disc.
If you are having issues just when the usb drive is plugged in.... well try a different one, it seems that the problem is the usb drive and not the wii itself.