Hello, I have an I Book G4 and am not having much luck with it! I have had these grey shut down notices before, which led to freezing and loss of applications. I had it in to a Mac store where they told me I had serious hard drive damage (? hardly used, may have been dropped with out my knowledge..) They were able to fix it, and its been great for over 10 months now. Today I was in my yahoo msgr account and wanted to open safari. My screen went grey and told me to shut down. Bad sign right? I cant seem to find anything that is a panic file in my history, but in my logs, for that crash it did say= Reason: Data stall on channel 7 while on a call, and then it lists a bunch about various signal strengths.. Any ideas or suggestions?