Everyone, however irascible, is a great help when problems, arise. I want to thank Adam, MBurke and Robert for your responses. I wanted to thank you while I have uptime. I think I have a software problem as my machine runs fine and reliably from an external firewire drive. I think I will re-install OS 10.2 (from disk) and upgrade to 10.2.4 via updates. One other question, though I have a complete set up on the external drive, I can't email from it because: "the server can't respond on port 110". This is the port my main machine emails from. Is this a problem with my cable modem or is there a setting I need to change. I have mirrored the settings of the internal and external systems. This become important if my main machine gets cranky and I net to reach this list. Thanks again, this is not the first time I have benefited from your advise, experience and elevated understanding.