Problems Installing Suse in a iMac G5

I can got it done once after one ubuntu installation and the system runs fine. Before that I never can put suse for two problems: 1 don’t let me do the partition thing. 2 the screen show me a lot lines and don’t let me see anything.

When I can install the system everything was running fine but suddenly start giving me the lines again and the system froze.

Maybe some body can give a explanation why this problem whit the screen happen (maybe is drivers or a bad kernel).

Could you describe the lines? Lines of text? A garbled screen?