I have been trying to fix an issue with my ibook locking up seemingly at random times. my system.log has a few errors, such as: 1. kernel: I2CUserClient::read cannot read from I2C!! 2. Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd": exited abnormally: Hangup 3. Sound assertion "0 != err" failed in "AppleLegacyAudio/AppleTexas2Audio/AppleTexas2Audio.cpp" at line 960 goto Exit I think there is an issue with the lookupd which I have researched on the web, but I am worried about the other issues and wondering if there is a painless way of fixing them. I have no idea what I2CUserClient is and don't understand why my sound is freaking out. Any advice would be appreciated. I just recently installed a new HDD and memory.