Strange thing happened...

I replace CPUs (4000+ sandy ==> 3000+ venice) and venice have unlocked multipliers to 25x. I tried another CPUs and clear CMOS, but venice is still unlocked. I think, that something was burned inside venice.
And my question is: How find what was happened with my venice? Is possible to unlock another CPU, if i will know whats happened in this event?

heres pics: http://www.pirs.vyrobce.cz/venice.htm
I have DFI NF4 Ultra-D, 2x512 RAM, 6800GT, 425W Enermax PSU

and sorry for my bad english...