Do any of you camera/computer buffs know why
all of a sudden I'm having trouble getting card readers (both the installed ones in my computer and those plugged into a USB port) to read the SD memory cards from my cameras? I've tried four different computers (Mac and PC)and several different card readers and different brands of cards. Some cards
are readable and some aren't. I can always hook up the cameras and get results, but from the readers I just get a message that either says "please insert a card" or "this card is non formatted, would you like to do that now?". I use a Canon Sureshot or a Nikon Cool Pix P90.
I took everything to the guy at Wolf Camera and he didn't have an answer. He did get one of the readers he tried in the store to work. But several others would not.
I can't find a common denominator for why some cards are accessible and some aren't.

Thought I'd run this by the most creative and brainiest bunch I know.
Love, Ima