Card readers not working

I have a card reader that will not work with my macbook.
It is shown under the usb section but it does not appear on the desktop.
I have tried another and the same problem.
Thoughts please

I wanted to add to this...I did plug in a CF card the other day and that was recognized. I then tried my external hard drive directly again in a front USB port and it worked for a while (an hour or so). Then it suddenly was not there anymore as if I'd ejected it even though I didn't. Tried to put it back in and nothing. This tells me it may be a hardware problem since it "recognized" it for a bit. It's very frustrating.

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Thread locked
Andy ______________________________________
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Hi. Unfortunately my ethernet card was not working anymore. This is the message "This computer does not appear to have any PCI Ethernet card. How can I fix it?

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i would try an SMC reset, the following article tells how to do this:
http://support.apple.com/kb/HT3964
if it still gives that message, you need to take it to apple store or apple service provider to have a new card installed. the apple site gives listings of providers and stores in your area:
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To show what I am talkin about I did another test. I downloaded and ran LuxMark. There it is possible to test CPU and GPU separately on a same benchmark scene. FIrst I let the system switch to nvidia and did the test:
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Card readers not working

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