Hello again, i have a powerbook g4 that i bought few weeks ago. its a 1ghz 15" aluminum. after bought it i have added another RAM module of 512 MB that was working on other ibook, and installed Lubuntu on it, with out any problem. Yesterday i formated the HD and Installed Debian and the osX 10.5.. but the problem becomes after booting on osX cause the powerbook hangs, it shows a black screen asking me to turn off the computer by pressing the power button for more than 2 secs. i have tried to change the RAM modules between them and with other in other computers and the problem stays. Mi question is: is there any way to know why the message is displayed? somehow to get more info? Thanks a lot.