I have a Dell Dimension 8100 computer that I inherited from my stepdad. I know for a fact that he bought two new sticks of 512 rambus mem. as an upgrade before he gave the computer to me. The reason he gave it to me was because he said it was "on the fritz" and he had bought himself a new computer anyway. (AMD Athlon with 64 bit architecture). After shutting down the computer it will not reboot for about an hour to sometimes about an hour and a half. It sounds like it is booting up but never powers up the monitor. I have read similar posts to mine and have followed the recommendations in them. I am getting a yellow A-B and green C-D which means it is not booting the memory correctly and i have tried over and over to reseat the memory and it still does the same thing. Once it does actually boot i can go into the bios setup and see that is recognizes the memory as two sticks of 512 rambus mem. but then when i look at the total memory count it is only 960. Coversely, when i right click on my computer in windows it says I only have 960, but when i go to the system information window it says i have 1024. So what gives? Is this a motherboard problem, a memory problem, or possibly something else. My friend has a theory. he says that heat can casue the pins in the memory slots to droop and not contact the memory correctly and therefore that is why it seems the board must go through a cooldown period before booting again. I am desperate to get my computer working correctly again!!! Imagine not being able to restart when you need to!!! Please help!!! Thanks.