IMac refuses to recognize USB with flash card

After I plugin my USB flash card holder, my iMac only occasionally recognizes it and then an error message comes up saying that the flash card was not properly ejected. The message disappears and so does my flash card! I may remove and reinsert it several different times and if it is recognized, I receive the same message.
To my knowledge, I have always ejected the flashcard properly.
How can i get my iMac to recognize the card so that I can use it?
Thanks for your help.
Vernon Snider

If you have not done so since noticing this problem, shut down (power off) the iMac, then start it back up. For hardware, just restarting is not the same thing.
Otherwise, you will have to rule out the possibilities.
(1) The card reader is bad. No way to test this other than to get a replacement.
(2) The flash card is bad. Try a different one to see if it works more reliably.
(3) The iMac's port is bad. If you have some other type of storage device, such as a USB external drive, try it on the same port.
(4) A problem with software (the system). Restart from your Mac OS X installation disc for the currently installed system; insert disc and start up with the C key held down. This will get you to Installer's first screen. Go up to the menu bar, and under Utilities, select to run Disk Utility. Connect the USB card reader with flash card to one of the iMac's direct ports. Does it appear in the Disk Utility sidebar? Does it stay there, without the ejection error message appearing?

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