Ok, bearohs1950, i can help you… go to Finder, then Preferences, and make sure that the box(es) for show removeable drives, show Cd’s and Dvd’s, show connected drives , etc are turned on( eg, there is a checkmark in the box) and when your usb flash drive is plugged in to your desktop mac via the usb port( front or back) it should show up( be visible) on your screen and in disk utilty… otherwise try 4 pram zaps on startup or try starting up in safe mode and see if the problem reoccurs.
hope that helps you
john B
john b