Intel DN2800MT big issue

Version 3

    I've got issue with desktop mainboard Intel DN2800MT. PC has worked as NAS server (24h/7).
    Once upon a time, my PC has not stated - diode is blinking when I trying to start and nothing else happens.

     

    What have I tried to resolve this problem:
    - Reset BIOS
    - Run PC without DDR's
    - Was tested with different DDR's
    - Was tested with different power adapters

     

    Power adapters are working fine with other of my Intel's mainboards - so i suppose that's not the problem.

     

     

    Please provide me solution for this issue.