I've bought iMac G4 700 15", 128+256mb, 40Gb - year ago. Everything was working good. Two weeks ago the black faulty screen showed up the first time. Sometimes it happens once a day sometimes every minute. Bummm ... I've reinstall system. Did all updates. black screen again. Three days ago I've took away 256mb of RAM memory. It's a CRUCIAL 256MB, 144-pin SODIMM, SDRAM, PC133 memory module Now with 128mb of system memory computer is working totally perfect. No black screen or any issues. What do you think. Do I need to buy new RAM? or ? Please any suggestions are welcome. Thank you.