York Diamond 80 Model P4HUB12N08001A

We live in a rural community and this past week were having a problem with the gas pressure from our well. Atlas came out and fixed it yesterday. Last night, the furnace went caput. I've got juice to the furnace and to the leads that connect to the motherboard. I have no lights lighted on the motherboard. We just had the board replace approximately 2 years ago... I tried resetting the board by turning off power for 10 seconds. no activity. Jumpered the thermostat, and still nothing. Thermostat appears to be working. One of the boards mentioned a purple fuse. I can not find it. Any suggestions? Thanks Terry