From what I can dig up on your system, it does not support P4 processors with 1MB of L2 cache, it only supports P4s with 256kb or 512kb of L2 cache. This situation is very common with many older P4 desktop systems.
The bottom line is that I don't believe you will be able to use the 2.8GHZ P4 you have in your Compaq.
okay. That is my conclusion also. I really appreciate what you have done in my problem and that keeps me feels okay right know.. thank a lot for your time..This also a good site for the people really need helps in IT matter..more power to yoU COLGEeK