computer crash help!!

Hi all
Can anyone tell me if they have had a problem with their computer crashing.
This my problem, My mach 3 software has suddenly refused to enter my G code
previously when the g code was accepted as soon as I cycle start my computer crashes
Can anyone help?

The only time I've had mach3 crash is when I tried a very high kernel frequency. Have you adjusted the kernel frequency?

Hi Jonathan

No I have not altered anything. I have actually cut a job but this has suddenly happened