Click the Install button in Pacifist and enter your administrator password. Scroll down and find the file IOUSBMassStorageClass.kext.Click the triangle next to "Extensions" to expand it.Click the triangle next to "Library" to expand it. Click the triangle next to "System" to expand it.Drag the Mac OS X installer package by dragging it onto the Pacifist application icon.Download and install the shareware application Pacifist.Download the appropriate version of the Mac OS X combo updater the one directly precedent to when you started experiencing the problem (for instance, 10.4.9 if you started experiencing the problems under 10.4.10, or 10.4.10 if you are already running 10.4.10, but started experiencing the problem after a security or other system update) from Apple's download page, but do not install it.Revert USB kernel extensions Another possibility, if you really don't want to reinstall the system, is to install earlier versions of these files: It's surprisingly easy, and you'll retain virtually all data and settings in the process. Re-install the system Don't be overly hesitant with this method: use our tutorial on reinstalling Mac OS X to the problematic update off your Mac and revert to an earlier system state that did not exhibit conflicts and other USB device problems. (These are probably present on your Tiger installer DVD, if you have one, but the best way to obtain them, if you have a broadband Internet connection, is to go to, join the Apple Developer Connection as a free online member, and log in to obtain the most recent Xcode tools installer as a 1GB download.) Apparently, just running USB Prober does some sort of USB reset that can "wake up" unresponsive USB ports. It is located in /Developer/Applications/Utilities, provided you have installed the Xcode developer tools. USB Prober You might try running USB Prober. The reasons why this workaround is so effective are varied, but one is that re-installing the combination update can replace components - including those related to USB functionality - that were damaged during the initial update process (the combo update is larger in size than the version-to-version or "delta" update and makes any incremental release current ) Re-apply the Mac OS X combo updater And oldie but goodie: navigate to Apple's download page, then retrieve apply the combination updater that matches your system (e.g. Check your device manufacturer's site or VersionTracker for any new revisions. Update firmware If your USB device's firmware is out-of-date, you might see issues, particularly after system updates.
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