Thanks for all your replies--unfortunately, I can't solve it right now because my friend will be out of town for awhile. However, to reply to a couple of your queries: The cable is not damaged, because we took the drive back to the desktop G4, and it shows up fine every time. Also, the hard drive DID NOT show up on the laptop BEFORE we installed its software, and it also DID NOT show up AFTER. There may be a software conflict, but it must be from something else previously installed. His printer works--we tried it on both of the USB ports, so that doesn't seem to be the issue either. I realize any version of OS9 should make it work--that's why I'm baffled that the older OS lets it work, but the newer doesn't. I understand Steve's reply, but my friend doesn't have a firewire cable--the hard drive was his choice, so I need to make that work without spending any more of his money :-) I think when he gets back from vacation, I'll take both machines up to 9.2.1, do some different extension sets, and see what happens. Thanks again! another scott From: Ron Steinke <ronsteinke at mac.com> Subject: Re: [G4] Mass storage problem Date: Sun, 11 Jul 2004 12:06:40 -0700 On Jul 11, 2004, at 11:15 AM, hachapitees at lightspeed.net wrote: <He hooked up a external hard drive (USB) to his desktop G4 to copy some files over to his G4 laptop. The drive shows up fine on the G4 desktop, which is running 9.04. When we hooked it up to the Powerbook, which is running 9.1, the disk is a no show.> Did you simply move the external drive to the laptop and use the same USB cable? It IS possible that you have a damaged cable. Did you try other cables yet? <I tried to install the Apple 1.3.5 Mass Storage extension, but it said it wasn't needed on this machine. The drive is an AcomData, and we installed the software that came with it on the Powerbook, but still no go.> As long as you are using OS 9+, you should not have had to add any other software. The machines and OSes that you list are capable of using USB without any added help. You may have created a conflict when you installed the new software. The laptop may not "know" which software to use and therefore simply stop trying to recognize the USB device. Have you tried connecting any other device to the laptop to determine whether it is ONLY the external drive that isn't working? I suggest removing the new software and trying again with only the original OS software installed. You may have to do a re-install to get the USB functionality back if it has been corrupted in any way. Happy hunting. ------------------------------ -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .