Hi, everyone , I'm new to this forum, I wanted to add more ram and a bigger hard drive, My iMac is a 800mhz with 512mbs of ram and an 80gb hard drive my serial number is QT2412Y6N0S, and when I put it all back together it goes on but the monitor stays black, I can here it start and it makes the start up noise and everything but the screen stays black did I not connect it right or did some how I broke it, I have put it back together and take it apart aging to make shore I did not miss any thing but it still has a black screen, please help I love this mac. Sorry If I put this in the wrong topic. Thanks