I've got a G5 running OS 10.3.9. I've been working with video files all morning, going back and forth from a Windows machine to my Mac using a 300GB external drive with USB. As of about an hour ago, when I connect the drive to my Mac I get the drive icon, but when I try to open it, I get a wait cursor and can't click anything. It stays like that until I power off the machine. The drive continues to work fine on my Windows machine. I've tried different USB ports on the Mac. Unplugging the drive doesn't do anything, the drive icon remains on the desktop and the wait cursor continues. Any thoughts?