Hi. I recently changed my motherboard and cpu, and have had no problem for the past few days. However, although I had 8gb of ram installed, it was telling me that I only had 3.5 usable, even though I have Windows 7 64 bit. So, I attempted to fix the problem. Long story short, now my computer won't start up. The worst part of it all is that I know exactly what I did. I had read that you can go to msconfig, advanced settings, boot, and change the memory there. I made the mistake of changing the memory from "0" to "2000". Now, the computer will not start up; it will attempt to take me into a recovery system, but even that fails. Is there no way to start the computer and just change that setting back? It's killing me that I did something so stupid to essentially destroy my computer.