External USB HD doesn't show up on the desktop

I have an iMac G5 with 10.4.10 installed on it
Last week after the update to 10.4.10 my LaCie usb conected hard drive still showed up on my desktop but after a second restart it disapeared and never came back.
If I connect my external HD with a windows computer (with macdrive software) I can see and open my files. (I concluded that my drive still works propperly)
If I connect my drive nothing shows up on my desktop but, there is a change in my /volumes map (I have an map action connected to an automator script if some thing changes overthere). When I connect my HD I can see an automator action is going on ...
And if I put the power of from my usb drive I get an warning that a drive was unmounted "unpropperly" (the warning when you plug a usb out without draging it to the trash).
I have al ready tried :
*Putting my mac on and of again, didn't work
*Putting my HD on and of agian, didn't work
*Opened disk utility and checked my external drive, disk utility can see my external drive but it showed no errors when checking.
*checked my Finder preferences, removeble media should show up on my desktop
*Opening usb prober; overthere I can see that my external HD is connected, but my HD would show up magicly on the desktop like some other lucky people on the internet.
*Rebuilding my directory with diskwarrior, didn't work (diskwarrior did saw my drive and said it did show up on my desktop
*Restoring IOUSB...keys from the combo 10.4.9 updater, didn't work
*Reinstaling 10.4.0, my drive didn't show up either, updated everything back to 10.4.10, won't show up.
Does anyone have an idea what I can do to get my drive up and runing again on my iMac?
BTW; English is not my native language, I'm sorry for the inconvenience.
iMac G5   Mac OS X (10.4.10)   1 GB RAM

Hello, I'm having the exact same problem as Cheburashka, actually it started happening almost as the same time (jul 23). I just switched from being a PC user to a Mac user, so I don't know much about OSX yet. Cheburashka mentioned he made an update, I also made a sofware update, maybe it has something to do? Also my desktop stopped showing my external usb HD
and any other USB flash memory I plug into any usb hubs. but when I tried them on a pc, they worked perfectly, so I also discarded a possible error on my usb device, I tried my usb joystick and the keyboard on my G5's usb hubs and they work perfectly so is not a hardware problem either. I'm about to try that invisible-hd fix right now but I'm a little worried cause I've never used it, seems like a big deal, anyway I'll keep up with any progress you guys make, thanx.

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