S7 300 BF blinking and SF

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I am new at Siemens Plc. My problem is after power interruption my S7 300 alarm BF 2 and BF 3 blinking And SF too. I reset the entire system but still BF2 and 3 still on blinking. 

What should i do. ? 

Thank you.

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Open STEP 7 and go online with the hardware configuration to see which Profibus or Profinet nodes are not communicating.  If you don't have STEP 7 software, you have to look at all your Profibus or Profinet nodes to see if they have an error indication.  BF means "bus fault", which means one or more nodes on network 2 and network 3 are not communicating.  Could be a cabling problem, Ethernet switch problem, or device problem.

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