Need Help! Controller stopped working

After 2 full days trying to find out why one servo motor was faulting my system,
I changed my computer to an old laptop that had a parallel printer port.

Everything seemed to be better. Changed the one servo, changed the cable,
but then, all of a sudden, the pageup and pagedown, that raised or lowered the
z axis, would only go up, no matter which key I pressed.
Then no keys would work at all. The servos still have power, but my computer
won't operate anything.

My system is:
Dell Inspiron Laptop with Windows XP
Camtronics parallel port 3 axis controller
Mach 3 2.0

If anyone has any ideas, please let me know what may be wrong.
Did I fry the parallel port?

Help Please!
Ken