TURBO CNC "hangs up"

Hi, im trying my "just finished" cnc lathe,wich i design and built
from cero. i have controllers hooked up, (leadshine 5056) and
everything seems to work just fine...i can jog, i can use the limit
switches, etc, but the computer or just "turbo cnc" hangs up, and
when it does, even the EMERGENCY SWITCH doesnt works. and the
steppers keep on runing,
so its a real problem. i have to quick shut off my "CNC BOX" to turn
of my spindle and stop the steppers...and preventing them
to "destroy" the lathe

I boot to DOS directly. just for reference

only thing "weird" is that i have my limit switches wired to pin 11,
and 12, and those pins are high state and low state ,respectively.
both in NORMAL STATE; WITH NOTHING HOOKED UP to it.

i have them as wired as :

pin 11 (home switch & limit for X), high state , configured as ACTIVE
LOW
pin 12, (home switch & limit for Z) low state , configured as ACTIVE
HIGH
what i did now was un-hook the spindle from the relay that is
controlled via pin 14, so i eliminate that as a problem/interference
and turn it on, and off using a regular switch. (its a low power
command, that comes out of my siemens-micromaster 420) but is
disconnected it anyway.. the problem persists.

i cant try mach2 demo or anything else, because my cnc pc is a
celeron 300mhz/64/6gb. so on this pc only resource should be TCNC.

sorry if the post is writen confusing.

i hope someone can help.thanks in advance
MARCOS