oceanis11 0 Newbie Poster

I am trying, unsuccessfully, to install a PCMCIA 4-port USB card into a Dell C540. The card is recognized, and drivers appear OK, but is isn't working with any USB devices. I am trying to isolate the problem to the Dell machine type (I have tried a couple of C540/C640s); the USB card type; or a bad card. Can anyone confirm if they are successfully using a USB 2.0 4 port Cardbus on a Dell C540 or C640.
What make is the car being used?
Thanks