Paul Moortgat said: >It's for a year now that his clock is set to another time each time >he starts. He used to work with it without any problem so far. Since it is inexpensive and easy to replace, the PRAM battery is still the first thing that I would try. If that is the only problem that he is experiencing, my bet is that that will fix it. If the problem were the RAM, or hard drive, it is quite likely that he would be having other problems. Of course, it couldn't hurt to run all of the routine maintenance at: OS X Routine Maintenance and Generic Troubleshooting http://www.macattorney.com/ts.html and to run the Apple Hardware Test CD. Randy B. Singer Co-Author of: The Macintosh Bible (4th, 5th and 6th editions) Routine OS X Maintenance and Generic Troubleshooting http://www.macattorney.com/ts.html