can I execute a shell during "booting"?

["john smith" <inquirer23@hotmail.com>]

hello,

 I would like to know if there is a way to execute a bash shell or whatever 
shell during "booting or bootstrapping" of the kernel. i.e. while the kernel 
is booting. I moved something and the kernel keeps looping and looping 
trying to find it and it doesnt want to stop it just keeps going and going 
and going..now if I can execute a shell somehow while it is starting to 
"boot" ..I am sure I can put it back into place.

thanks for any advice.
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