Sounds like an extension conflict. You've probably thought of that but check that you don't have 2 of the exact same extension - one in the Extensions folder and another in the Extensions Disabled folder. If you do, throw out the older of the two. You could also try searching for error -127 in the Apple knowledge base and see what comes up. (sometimes nothing useful) DR >Now, everytime I go to start up, the imac gets stuck. I can see the >progress bar, but it gets stuck around 15% of the way every time (not >holding down the shift key). How do I remedy this problem and get my >imac to start up properly?