My Laptop card reader is not working anymore.

What went wrong with my laptop’s card reader?
I bought my laptop with Windows Vista installed.
All went perfect and I have no complains.
One day I decided to upgrade my OS to Windows 7 and things were seem to be fine as well.
However, I discovered one day that its card reader is no longer working as it could not detect anymore the SD card that I inserted to when I wanted to transfer the photos to the hard disk.
It is the same card it used to read. I tried other cards but still I got no response.
What could be the possible problem?
Your help will be greatly appreciated

