My friend gave me a Pentium D 830. It is a good CPU and I want to use it in my Dell Optiplex 320. It is currently running Celeron 420. After seeing a few YouTube videos, I finally installed the CPU on the board. Then I turned on the computer. The led turned yellow and cpu fan running very fast as well as noisy but the computer wonít boot at all. If I put back the Celeron, it works correctly.