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Some times the card readers ( even embeded) need drivers. My printer an EPSON R300 has also card readers and an USB port. The readers work fine but the USB needs special setup.
I think is not possible for card readers to comunicate via standard VGA cable. Try to find any other connection at the back of your monitor, an USB or DVI. Also read carefully the manual to be sure that your reader is active on your model. If everything is OK try to change USB port ( if exists)
The last you can do is searching for known issues in manufacturer website.
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