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ISY994i Flashing Memory & Error LEDs

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No network changes in several months, but suddenly the ISY is flashing two LEDS and not accessible via network.  I assumed PLM so have just rec'd and replaced the new PLM 24135 rev 2.4 8318 from Amazon.  Both off unplugged.  Plug in PLM, wait 30 sec, connect port A and power on ISY.  No joy, no change!  What are the next troubleshooting steps ?  



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