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Well your org.chameleon.Boot.plist looks fine. I assume you are running Mavericks. I would (just temporarily) uninstall HWMonitor sensors etc. if you have that running. I have found in the past that for some reason, the kexts from that can cause freezes unexpectedly. See...

Can you post a print out of your org.chameleon.Boot.plist to assist in knowing what flags etc you have running.

It repairs permissions for all system folders: /System/Library/Extensions and /Library/Extensions. I would also suggest doing a Disk Utility 'Repair Permissions' on your operative disk as well. Then restart. GenericUSBXHCI.kext is only needed for motherboards and systems that don't have...

I'm trialling Imac 14,2 system def when I came across this problem. I didn't want to change my def just yet. I went to Applications -> Utilities -> Audio Midi setup and changed my Hz rate to 88200.0. That seems to have fixed it. I can play iTunes and do the startup and shut down without...

Thanks for that. Worked for me also.

I removed the GenericUSBXHCI.kext from S/L/E. Didn't replace it with anything. Rebuilt with Kext Utility. Restarted and not had a freeze since. USB 3 and 2 both still work at prescribed speeds, and show as their respective speeds in Apple System Profiler.

steftrikia, Thank you for the excellent, and well explained tip. Love your work!!

sma1968, you are a savior. This has been beating at me all day and I stumbled upon this thread. Great work. THIS IS THE SOLUTION. However, I had one kernel panic after the first reboot but none since. My GeekBench score is still at 17488 (see...