I am getting old. I shuffled my D90's, have two of them. Sorry, it's still not working, D90 #1 does have the dreaded aperture gear damaged, so it doesn't record anything, but does AF, SD cards, any of them works. D90 #2 does focus and everything fine - except for the SD card slot...this seems to be damaged, electronically, mechanically it does work fine. But neither, no SD card ever is being detected, since the last time, being used that...some 2 years ago...how could that happen?