http://www.insanelymac.com/forum/index.php?showtopic=186596
After upgrading to 10.6.1, I lost support for USB mass storage devices on my system. I also noticed that if I plug in a USB keyboard, functions such as numlock don't appear to work on it, just basic keys work. What the strange part is, that the USB ports are recognized in my system profiler. This is a sample of one of the USB ports:
CODE
USB Bus:
Host Controller Location: Built-in USB
Host Controller Driver: AppleUSBUHCI
PCI Device ID: 0x27c8
PCI Revision ID: 0x0002
PCI Vendor ID: 0x8086
Bus Number: 0x1d
Host Controller Location: Built-in USB
Host Controller Driver: AppleUSBUHCI
PCI Device ID: 0x27c8
PCI Revision ID: 0x0002
PCI Vendor ID: 0x8086
Bus Number: 0x1d
If you need any other info (such as kexts installed) just ask. Any help is appreciated and thanks for reading.