USB Device Not Recognized

Which devices do you have connected to the USB ports?
Perhaps try disconnecting then one at a time to see which device is causing the error. Once determined then perhaps you can reinstall that device's driver.

Axel F.

I have the same problem. It started at or after Jan 1 2008. In my case it is randomly occurring. Once it starts, it goes on and on for ten minutes or so, popping up the "usb not recognized" message every few seconds and then closing it automatically.

It doesn't matter wether anything is plugged in to any USB ports or not.

I re-installed the bootcamp Windows drivers from my Leopard CD and the behaviour did not change.

I do have the same problem. suddenly, the USB port does not recognize the cameras nor flash memory. A message appears saying "The USB devise is not recognize, initialize, eject or ignore" I did the automatic MACOSX from 10.4.10 to 10.4.11 and so many problems appears and also I did the automatic windows XP and after that, MACOSX can not recognize (you can't it) the windows partition.
The people at applecare told me to format the disk and star over. I can't do that, I have so many programs with authorization installed

I'm having a similar problem on my imac G5. I have a digital audio recorder attached via USB. The device appears in System Profiler and indicates that it is communicating with the computer, but there is no icon on the desktop, consequently no way to open the device to transfer audio files. The device works on my Macbook, but not on the G5. I've switched USB ports and hubs. I've restarted the computer and the device. I've verclempt at this point.

I have the same problem!!! I've tried repairing permissions, clearing cache, and nothing works. I've called AppleCare and the best they could do was tell me to try something else! ipod and blackberry are fine, but sony dsc t1 camera and card reader just don't show up. Have you been able to fix the problem? Any help would be appreciated.

I have come across the same problem. I found a temporary solution, but am still looking for a permanent fix.

in Terminal type:
sudo kextload /System/Library/Extensions/IOUSBMassStorageClass.kext

this should work until reboot or so.

Have Belkin Pci card for upgrade of Usb 1.1 to 2 in Power Mac G4. After upgrade to 10.5.2 Usb ports no longer functional. Read numerous reports of similar difficulties with Leopard upgrades. As suggested by a previous mac inquiry. I reset my pram and viola' everything is working okay.

I have a Macbook and I have this problem, and have had it for MONTHS. I went to the most extreme measures... I bought Leopard, and a brand new copy of XP, and basically recreated my entire Macbook. Upon hundreds of dollars spent, and hours and hours of work, guess what...........I STILL HAVE THE PROBLEM! Is there no hope? Obviously it is a Windows issue, ofcourse.

I own a 2.4Ghz, 2GB MacBook Pro which is about two months old running Leopard 10.5.2 and Windows XP SP2. I experienced all manner of issues with USB devices. I have not attempted using the Bootcamp 2.1 as yet. It won't always detect USB devices have been plugged in or it starts the "Found New Hardware" wizard and never finishes or complains about the .INF file not being compatible. After much frustration I decided to try a Repair install Of Windows. This is when you go to install Windows and you choose the Repair option. It preserved my settings and suddenly the USB devices could be installed successfully. I also installed the Windows Multi-core CPU hotfix. It's mostly stable now but I find running Music recording software such as Protools 7.4 on XP a challenge even after disabling as many device drivers as I could. I suspect there is a problem with the Bootcamp drivers for this platform. When running Itunes under XP for a long period and the Wireless network is active, Itunes will start slowing down and speeding up. Turning off the Wireless network and using a direct Ethernet connecting helps. I did NOT reinstall the bootcamp drivers after Windows repair. I have not been daring enough to try a bootcamp upgrade as too much time was lost getting thus far. Apple support people feign deafness when you call up for advanced bootcamp issues.