I was trying to swap command and option key for my external keyboard following the instruction in http://hints.macworld.com/article.php?story=20110529094802391.
When I'm done with change and I restarted, my mac booted with Kernel panic message. I'm sure I've messed the info.plist file. Now I cannot boot in safe mode as well.
I know if I get a way to change the file it should be fine.
The message shown in screen is
panic(cpu 0 caller 0xffffff80002c4794): Kernel trap at 0xffffff80005eae1e, type 14=page fault, registers: ... Debugger called: <panic> Backtrace (CPU 0), Frame : Return Addressd ... ... can't perform kext scan: no kext summary BSD process name corresponding to current thread: Unknown Mac OS version: Not yet set Kernel version: Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48PM Kernel UUID: ... System uptime in nanoseconds: 11...
The error specifies the problem in kext as well.