Ok I've got a guess here as to solve your problem, or desire for what ever reason you have to want to do this. When a computer loads up, it looks at the CMOS memory on the mother board and runs a bios startup sequence which does a few tests and processes, one of which if i were a guessin person, display the CPU information. All you have to do then, is modify the instructions in the CMOS to not display the information.
Your next question is, "But Mr. Skullbro how do i do that?"
The anwser to that question is, if you are asking it, then it is above your head, and your best bet would be to go do a search and do alot of reading about the Bios, and search the Motherboard makers homepage, and search for a bios version that won't display that information, unlikely.
Why do you not want it to display the cpu information?
Trust me, if i started killing people, there'd None of you left