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Glad your running

You may have some damage Gary. Was the breaker tripped during a storm? It may be an electrical spike. Never the less what I would do is buy some new CAT 5 cables. 25 foot yellow, green and blue.
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Try turning the power off on the controller and on again and then open your Mach 3. Did you change anything on the PC lately?

Gay do you connect with ether net cables (Yellow, green, blue?)