Usb flash drive wont mount on desktop

my usb flash drive no longer mounts on the desktop or shows up in disk utility.When i plugged it in the green led did a series of flashes with 3 intervals and the cursor froze.Unplugging it brings the computer back to normal.It works fine on a powerbook and on a pc at work.I re-formated the drive on the pc using fat32 and it works fine.(dragged files out first and back again after re-format).Now when i bring it home the green light flashes continuous and does not affect the computer in any way but it still wont show on desktop or in disk utility?.
imac 333   Mac OS X (10.3.9)   512m ram 40gig 7200 harddrive

I have a few devices connected all right but they work fine on either usb input. I think maybe the system software may be damaged somehow but i am only guessing and i dont want to re-install in case i am wrong.
imac 333 Mac OS X (10.3.9) 512m ram 40gig 7200 harddrive

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