Sd card reader does not show up as a external hard drive any were on my mac

i have a sd card reader that is run through usb. i plug it in whit my card in it that has files on it but the driver does not show up any were not on the desktop not any were ive gone through the trouble shooting on apples sight but no luck. any one have a idea?
the weird part about it is that it worked a few weaks ago no problem like i would just plug it in and it would show up on my desktop

It seems that Intel Macs have problems seeing (the media in) some USB storage devices.
For example I have a Zynet CR-T1-U28 8-in-1 memory card reader. It works A-OK on an old Powerbook running 10.3.9, and on several PPC-based newer machines running 10.4.10. The cards I've tried in it mount immediately and show up on the desktop (and iPhoto starts automatically if appropriate).
However none of the FAT-formatted cards I've tried will mount on any Intel-based machine I've tried it on (all have been running 10.4.10).
Here's how it shows up on my Macbook:
USB Storage Device:
Version: 1.00
Bus Power (mA): 500
Speed: Up to 480 Mb/sec
Manufacturer: Generic
Product ID: 0x3260
Serial Number: 20030903213338562
Vendor ID: 0x0aec
And here's how it shows up on the old Powerbook:
USB Storage Device:
Capacity: 60.75 MB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk1
Vendor Name: Generic
OS9 Drivers: No
Product ID: 12896 ($3260)
Speed: Up to 12 Mb/sec
Bus Power (mA): 500
Serial Number: 20030903213338562
Interestingly one kind of card I've tried, a Sandisk M2 card, the 64 MB card shown on the powerbook, mounts A-OK when it's in my Z710i phone and is connected via USB to the macbook. At first I thought the card reader could be at fault, but given the number of (admittedly vague) reports I've seen here today about similar problems with other devices I'm more inclined to blame some driver or kernel problem on Intel macs.
The following showed up for the first time ever in the console log during today's test to get the System Profiler data:
Jul 22 14:27:17 macweird kernel[0]: USBF: 773285.286 IOUSBCompositeDriver[0x60c0c80](USB Storage Device) GetFullConfigDescriptor(0) returned NULL

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