I encounter this problem before. After installed everything. Then as soon as the reboot process begins to load completely done then the X wont start, even does the cd-rom or the floppy is in-accesible. for the X on startup i suspect its the Graphic card. What graphic card are you using ? Other then startX did you go to the Xconfigurator and check the Graphics setings is it in the correct possition 800x600 1240x*** , Monitor probeing is it able to detect the correct monitor or have you choose the correct Monitor during the Instalation ?