mako dt 3500 card reader quit

so i went to download as usual today and when the card went in i got the red light but no green light. thought maybe a card but i get the same thing on my spare card. i tried reloading the drivers with no luck . i checked to see if any new updates to my puter was causing the problem mo such luck . anyone want to share thier thoughts/ expeiences?

At some point in the investigation, I'd wonder if the contacts in the card reader had picked up a piece of dirt from the card. Unlikely, but who knows? Might be able to clean them with a piece of thin cloth stretched over the card...