Point to Kernel Conection and then click Cycle Initial Break on the Debug menu to change the conditions on which the debugger automatically breaks into the target computer.
This command is equivalent to pressing CTRL+ALT+K. (You can also press CTRL+K in KD.)
This command causes the kernel debugger to cycle through the following three states:
The debugger does not break into the target computer unless you press CTRL+BREAK or Debug | Break.
Break on reboot
The debugger breaks into a restarted target computer after the kernel initializes. This command is equivalent to starting WinDbg with the -b command-line option.
Break on first module load
The debugger breaks into a restarted target computer after the first kernel module is loaded. (This action causes the break to occur earlier than in the Break on reboot state.) This command is equivalent to starting WinDbg with the -d command-line option.
When you use the Cycle Initial Break command, the new break state is displayed.
For more information about related commands and an explanation of how the restart process affects the debugger, see Crashing and Rebooting the Target Computer.