I have an iBook details are as follows: Machine Name: iBook G4 Machine Model: PowerBook6,5 CPU Type: PowerPC G4 (1.2) Number Of CPUs: 1 CPU Speed: 1.33 GHz L2 Cache (per CPU): 512 KB Memory: 512 MB Bus Speed: 133 MHz Boot ROM Version: 4.8.7f1 Serial Number: 4H51907SS85 When I am using the above computer, it just stops /turns off. I have to start it up again sometimes it will keep going, other times it will stop/turns off. It is happening more often now. Any advice to what the problem is, would be appreciated. Would it be a faulty power switch? I use computer from power line all the time. Regards johnf4 at mac.com