I have been having the same kernel error for about a month now. I wasn't doing much about it, because every time I restarted, it would work. It just took me about 15 times restarting to get the iMac to boot up. I have tried booting in safe mode (which works, but then I get the kernel panic the next time). I have tried unplugging all usb drives. I am at a total loss. I DO have everything backed up under time machine .... Is there anything I can do????