I upgraded to the 10.5.3 last thursday night, clicked on restart now, and my problems began. I am running a 24" I-Mac 2.8. When the system tried to re-boot I keep getting a screen that tells me to re-boot again (in 4 different languages). I have since learned this is a "Kernel Panick". I took the machine to my local apple store and they have been working on it since last week. I have yet to get a good explanation of what is wrong, the system will boot from their hard drive, but the system will not recognize my hard drive. They appararantly ran 2 overnight tests and the hard drive reports as fine. They said something about duplicate files and they are now trying to rebuild the hard drive now (whatever that means). Can anyone shed some light on what might be happening and translate some of this to rookie level? 🙂) It's kind of frustrating, both of our macs died within 2 weeks, the first was a G5x2 2.5 Powermac that had a processor fail now this....Luckily my old toshiba laptop still works...Thanks in advance for any info. Ed