Hi everyone, I'm new to this forum and I'm looking for help as to why my PC is displaying this message. After changing my BCLK from 180 to 185, I was met with the message "Missing Operating Sys_" on a black screen. I've tried using the Windows 7 CD my computer came with, but it can't reinstall itself due to a partition already being installed on the computer because "Unable to create a new system partition or locate an existing system partition". Basically, my computer is stuck at the black screen at this point. Any help is greatly appreciated.