[Q] Problem with YP-G70 stock rom topic

Hello I would like to help me with a problem with my device, I update my YP-G70 with Android stock 2.3.5 and 2.3.6 via Odin and the problem is i don't have default lock screen, when pressing power button not the shutdown menu appears and goes directly turn off.
There will be a way to fix this problem.
Thanks a lot.