My beloved PowerBook G3 (Pismo) just reciently got upgraded to 640 mb of ram. It then started having random crashes and video problems. (various lines on the screen. So, I tried swapping the old ram back in. BAD IDEA!!! Now, I get the startup chime, but no video from the the internal screen or the external vga port. I also for some reason get the open firmware to reset. (reset-nvram, reset-all) PLEASE HELP!!!!!!