Question No POST no beep no display pc

[Burakylmzbd]

Hello
3 month i build my pc everything is okay but today When i turn on pc fans spin a few sec then stop i try again turn on pc everyting is work but i cant get signal on monitor and phase leds are flash green green orange red .
MOTHERBOARD: gigabyte GA-P55-US3L
CPU: Xeon x3440 3.2 ghz
RAM : Laptop ram without adapter elixir 4gb 1200 mhz
Grapich card :gtx 950 2gb 128 bit
Psu:High power Eco 450 w

 

[Burakylmzbd]

2-3 days before i clean psu